Correct, minor bugs will be there, but since every environment is different, I'm sure you can appreciate why no on can answer that question for you (which on is the most stable one?) but you. There is no "most stable" one. Download
it to your environment and test it is the only way you can figure out what works for your environment.
As far as which CUs and fixes are included with SP2, those types of answers can be found in the KB article for a given Service Pack. For SharePoint SP2, it is here: http://support.microsoft.com/kb/2687453/en-us
Edit: Also, if a CU doesn't apply to your enviornment (I.E. you are running a later version than it is for, or incorrect version) it will tell you that it doesn't apply to your system and won't install.
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Edited by
DubaStep
Thursday, May 29, 2014 4:06 PM