I think the correct answer is to try both (and maybe others) for yourself. Personally, I've used Eclipse for the past ~3 years. I'm satisfied with it but there are parts that I think could be better.
But, I think your best bet is to install both and try them each for a week or 2 (maybe longer). A lot of this comes to do personal preference and taste. This is the 2009 version of the vi or emacs question :)
