Theme? You mean a background image?
Conversely, I find them either equivalent or sometimes with more features on Android.
Can you tell us what cross-ported apps on both platforms you're talking about?
In either case the user has to unlock and scroll to the homepage with the Facebook icon/widget.
The difference with the widget is that the user can see and interact with it right there if they wish, without having to wait for the full app to launch.
1. Nope. I mean theme. And here I am speaking from a jail-broken perspective and probably should have prefaced by saying so. Saying one phone, from a ui standpoint, is more aesthetically pleasing than another is totally subjective and as such I won't really delve into that.
However, the themes I did apply on the Droid X, and the applications used to apply them to the phone were clumsy unimpressive. At least when I seek out a specific theme on an iPhone (again, jailbroken), I can expect an ecosystem that is more accessible.
Wallpapers are mostly irrelevant here. Although they look noticeably better on the "Retina" display (and are once again, easier to seek out and find because support follows an adopted volume)
2. This one will vary depending on the perspective you are coming from. So for me, I will just start from the top with my most used applications (and those I can remember from using the Droid X);
Facebook: Was kind of a joke on Android. Operation was clunky and slow. Unbelievably, interaction with certain elements would open facebook in the browser? The widget updates inconsistently and the interface within the application itself, while usable, has no clear direction. Want to refresh your feed? You will be searching for a hardware "menu" button. I'm not saying it isn't usable, because it is. My point is simply that it is faster, easier to use, has more features AND looks better on an iPhone.
Sportacular: As a rabid sports fan this is something I use constantly every single day. The Android version requires more interaction with the "menu" botton if you want to make any changes. After selecting a specific game on the iPhone, I immediately see the box score, the entire games scoring summary as well as the stations the game was or will be broadcast on. Sportacular on iPhone also features social network interaction, allowing you to log in and chat with other fans about a specific game, as well as making picks and predictions on whom you think will win X,Y,Z game. From the main screen, both phones update every 30 seconds; the main difference being the iPhone actually provides an option for manual updating of scores with a simply button. Honestly, I can go on but I feel that is sufficient.
Tweet Deck: This one really supports the "ported" application hypothesis I proposed earlier. You cannot even get tweet deck in the Android Marketplace. You have to sign up for their developer program and then download an early beta version. TweetDeck for iPhone launched over a year ago. I could just as easily go through this application 1v1 as well and point to obvious deficiencies, but this does not seem necessary especially when you consider one is in beta...
3. You are absolutely right. However, my point was not the numerical amount of stimuli that is required to unlock the phone, scroll over,etc,etc. My point is that while you may be right about widget access from your home screen, I am contending that these phones are not nearly as fast as advertised and that I was able to unlock my iPhone and select Facebook (an application that backgrounds with native iOS4) taking me directly to my news feed, BEFORE the Droid X would struggle to unlock in a fit of lag, then I got the pleasure of watching it populate all of the icons, and lastly the widgets, all the while I can't interact with the phone because it is in a near frozen state while struggling to bring those widgets on top of an animated wallpaper that seems to be doing everything it can to consolidate a mass of system resources. And finally I can see the Facebook widget, which is now pinging its convenient network connection to update to the latest post. I could click on the "F" to take me to the application, but this would bring me to the news feed and mean that I have to select the "menu" button once again THEN tap refresh before I could finally arrive where I want to.
Once again, my contention is not that Android is terrible or un-usable. I feel that it is only an acceptable alternative at this point. Especially when coupled with hardware like the Motorola Droid X.