I've used Darren Hiebert’s Exuberant-ctags for a quite a while; it is an essential part of my vim toolbox. I tag python, Java and C code (I also use cscope).
Recently, I've read that I should be considering moving to a more modern fork of it called Universal-ctags.
I'm looking for specific technical pros and cons to making such a move: do the tags change? what new features, if any, can/should I employ? are there any gotchas I need to be aware of?