Public Beta 2 = Developer Preview 6
There is no difference.
What I find incredible, is that Apple STILL haven't fixed the Safari crash problem that they introduced in Safari 7.0.6 where 'Safari Web Content quit unexpectedly'
This problem has been ongoing since Mavericks 10.9.4 and is still present, as I type this, in 10.10 build 14A329f AKA DP6.
EVER SINCE Safari update 7.0.6, I have been getting errors that specifically name 'Safari Web Content'....
...I have to be honest, unless whatever-problem-this-is, is fixed when 10.10 is finally released, I will be advising ALL of my mac using friends, clients and associates, to stay the hell away from Apple, for the foreseeable future, because if they can't even fix a problem with a single application that they provide, how can they be trusted with an entire OS?
I have been an Apple enthusiast since the early 80s...I still have an Apple II - One of the machines that had all of Apple's senior staff signatures on the inside of the chassis, and I have bought EVERY model of Apple since then.
But, now? Now, I'm actually doubting buying an Apple...
...All because they can't even maintain a web browser properly - I shouldn't HAVE to use Firefox on my nMP or my rMB!!!
Since the combination of 10.9.4 and Safari 7.0.6, my macs have become a game show, with the user guessing which will crash and reboot first!