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Beta 3, my iPhone died on me and needed a full restore to get it working again :(
 
Worst for me is beta 5 because many iPads have lost translucency/blur effects and were replaced with slightly transparent but mainly greyish backgrounds.
Beta 2 was very bad as well because I updated OTA in a hotel and it failed to update so I came into recovery mode and I wasn't able to use or restore my iPhone for over a week.:(
 
Beta 3 for me was the worst. It kept something running in the background (which I never figured out), and drained my full battery in about three hours.

Beta 2 was good, but Beta 5 has been best.
 
Beta 1 - pretty good overall, but horrible battery drain.

Beta 2 - pretty much beta 1 but with much better battery life. This one was my favorite (looks-wise).

Beta 3 - introduced the new thicker font (which I hated), randomly froze when left idle (requiring a hard boot), randomly missed phone calls with no indication that the call ever came through (unless they left a voicemail), notifications were hit-or-miss as to whether or not they'd show up in the NC, Settings crashed any time you tried to select a new wallpaper... This one was by far the worst beta ever. I reverted back to beta 2 after only a day and a half.

Beta 4 - fixed everything wrong with beta 3 except the notification issue. I've now accepted that the thicker font is unfortunately here to stay.

Beta 5 - seems to have fixed the notification issue from beta 4 for the most part. Sometimes I find that I miss text message notifications completely, and only notice them due to the app badge, but this isn't very common or consistent. Overall I'm pretty happy with it.

I just wish they'd change the font back to the Light font of beta 1 & 2, or at least give the option to. The current one just feels too big.
 
Beta 2 was the worst on my iPad 3. Apps crashed frequently and IOS rebooted itself a lot. Beta 5 is better than beta 2 was but introduced a lot of bugs and stability issues.

Beta 3 and 4 were great for me, especially 4 where homesharing finally worked again.
 
Beta 4 was without a doubt the worse for me. Random restarts about every 5 hrs of use. I only had one random restart before beta 4.

5 has been good to me so far
 
Beta 2 for sure.

Went camping and phone bricked out at 15% battery for a whole day and couldnt listen to music in airplane mode (or take it off airplane mode) so I had to let the battery slowly die out in the ultra battery conservative airplane mode to even use it again because the only fix was to let it restart via battery dying because it froze me out of even the ability to do a hard reset.
 
Maybe it's not beta 5 causing this, but I'm currently unable to download anything ANYTHING from iTunes. When I try to, it says "Waiting..." for ever and never does anything. Can anyone help me?
 
Beta 3 was the worst for me. Constant reboots and audio apps would crash when adjusting volume (very annoying).
 
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