Depends on who you ask. Afaik all versions had bugs, some of them occured only on a few boxes, others didn't matter to most people, some were never fixed. Check the release letters and read the bug reports forum, then choose your poison.
If so, then I guess the latest should be the best, if we accept it should be the one holding all the previous changes.Afaik all versions had bugs
How do I get back to 10.0?