It depends on which ones, exactly, you're looking at - there is a differnce, for example, btwn Wellness Core or Wellness Super 5 - same with Blue Buffalo or Blue Buffalo Wilderness - so, which ones specifically are you lookin' at?
Personally, I really like the Core and the Wilderness - but think the other choices have merit too. It depends on what you're looking for. Also, I like grain free and mid-to-higher protein, so I take those things into consideration when considering foods.
So, whatcha think?