Long-time Notability user, who downloaded the Notes Plus to check out the handwriting recognition feature (which appears to work quite well, IF I concentrate on keeping my handwriting neater (i.e.) write slower)...
Some thoughts about the two:
Notability PROs >>
A1) The interface is clean and intuitive to use [subjective opinion];
A2) Fully updated to support the Apple Pencil and all the new iOS multitasking features;
A3) Audio-recording, and the management/editing thereof, is well done;
>> In particular, the greying out of the underlying text, dependent on the audio-scrub. Since the audio is synced with the text/writing, you can quickly scrub along in the audio, to get to the part of the recording where you were writing down what you need to hear the audio about.
>> Individual audio-note "sections" can be retrieved from the back-up location, allowing for those sections to be sent/exported, as it were.
A4) With the companion app on the Mac, the iCloud sync works well, and allows effective sharing across all iOS/OSX devices;
A5) Multiple back-up options [Dropbox; Google Drive; Box; WebDAV], and back-up 'format' options;
A6) Integrates well with other apps/sources >> easy to get PDFs etc. into Notability; Easy to share/export them out;
A7) Nice set of "media" that can be easily added to the note [stickies; shapes; web-clip; photos etc.]
Notability CONs >>
B1) There are not as many features (which is why the interface is cleaner) >> but the basics are certainly there;
B2) Organisation of the notes, whilst adequate, can be improved;
B3) A bit lacking in 'interaction' features
>> Would be greater if it could have a two-finger swipe for 'undo' [similar to Procreate'] etc;
B4) Only allows for 3 'Favourites' i.r.o. typing/font settings >> wish more could be added
>> Related to B4, I wish they would introduce a 'Favourites' for colour/thickness etc. for writing with the Pencil
B6) Using the zoom-box across multiple pages, especially when wanting to jump from one page into another, and continue writing there, is sometimes a bit buggy(?)
>> i.e. There is a serious elastic that can get stretched between where you are scrolling to, and the small-text box that the "zoom-box" will write into... Sometimes will scroll from page x, and try and write on page z, only to get rudely yanked back to page x;
>> Depending on the position of the "zoom-box" [which is a nice feature for lefty's like me], the small-text box sometimes disappears below the "zoom-box", which requires some funky jump-arounds to get to where you need everything to be >> doesn't happen that often, but often enough to be noticeable.
Notes Plus PROs >>
C1) Plenty of features >> but see D4
>> Scratching through a word to erase it >> nice! [take note, Notability!]
>> circling word/section for auto-select >> nice!
C2) Built-in browser that can be swiped over to, is a nice-touch, especially with the built-in "clipper", that allows you to quickly grab anything off the browser-screen, and have that automatically imported into your note;
C3) Writing to Text works quite well, at least it does in my experience!
>> You can convert individual sections to text OR do a once-off of the entire page
>> You will need to work on your penmanship, and it would probably help if you wrote most in the "zoom-box" mode, to be able to get things neater [however, see D5];
C4) 'Invisible' scroll-bars is nice!
>> As is the "long-touch" in the margin to pull up the page-contents view;
C5) Nice "additional features toolbar" on the keyboard (date/time/tab/bullet icon/cursors);
C6) Nice "floating text/styles toolbar" that can be left visible, to quickly access different font/colour settings for text
>> Ditto, the floating "ink" styles option, to allow to quickly select different inking styles.
Notes Plus CONs >>
D1) Hasn't been updated yet to support the Apple Pencil OR iOS multitasking features (no Split-View, only Slide-over)
>> It also doesn't appear to have been updated for the iPP 12'9"(?) >> stretched keyboard
D2) Limited back-up options: Dropbox only
D3) Audi-recording, whilst ok, is not as feature-rich as in Notability.
>> There is no direct-sync between the audio and text, so (unlike in Notability), you cannot easily work out what writing/text is associated with which section of the audio. A hack will involve you jotting down the 'audio-"time"' at points in your notes >> i.e. if you've been recording for 45 seconds (which can be seen as a timer is presented when you are recording), then quickly jot down "45s" at the point where you might want to listen to what was being said about that topic. Later, when playing the audio back, you can scrub to more-or-less 45 seconds into the recording, to hear what was being said there...
>> Secondly, whereas it is useful to have the audio-recordings all presented under a "audio" section in the 'file-manager', this is not as useful to me, since the audio on its own, is less important than seeing it in the context of the note(s) that was being taken at the time.
>> That said - having the audio stored separately, does allow you to export them individually from within the app, which - in certain scenarios - can be very useful.
D4) Interface is a bit messy [subjective opinion]
>> some of the icons are hidden away, requiring scrolling through to find
>> AFAIK, these can be re-arranged though, so this is not necessarily a bad-thing AND, keep in mind that I am used to Notability – pretty sure long-time Notes Plus users can whizz around inside of it, quickly getting to what they need
>> That said, after several hours of use, still battling to work out how to arrange them!!
D5) The "zoom-box" writing mode is not done as well as in Notability, imo.
>> Again, might just be since I'm not used to it, but I struggle with the following:
** The auto-advance box/feature, it all-too-often sees my text being rewritten over an earlier section of the text (it works ok if you are "writing a word 'into' the grey-advance section", but if the word happens to end just before the grey section, and you try and start a new word in it, it often jumps back (or elsewhere) to what was written before, and overwrites in that area;
** The "next-line/paragraph" button all-too-often/always(?) takes me one line down, but NOT to the beginning of the line - it kind of just drops down below where I was, unlike the "typewriter" action that I expect, where it drops lower AND takes you all the way left, to the 'start' of a new line.
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In light of the above, personally I wish Notability could incorporate some of the key features of Notes Plus (hello writing-to-text conversion) >> but that's probably since I'm so used to Notability... Both are good apps, and each having certain features that the other lacks, is the key reason to why we have CHOICE in the app store! Choice is good!
But suffice it to say, each of them are very good in there own way - especially considering that Notes Plus is hopefully due an upgrade soon, which will remove several of the CONs from my list, almost instantly!
That said, hopefully this comparison will make it a bit easier for people to decide, since the choice between the two appears to hinge on the key features and what is more important to you: Audio-syncing to notes = Notability; Writing to text = Notes Plus!