With EZ Drummer 2, I found myself constantly frustrated, unable to achieve a good, powerful rock sound that wouldn't somehow get lost in the mix. The toms were especially poor. With Superior Drummer 2 however, it was like night and day! I barely needed to apply EQ, everything was less muffled, clearer, and a lot more gutsy, which cut through much better, especially with the toms.
It's a pity they don't provide free trial software, but if they did I suspect comparisons may expose EZ Drummer's inferior sound quality. It would make far more sense to merge the best features of each into one piece of software, because as it is, two Toontrack products are effectively in competition with each other in the same market, which makes no economic sense to the company with regard to a duplication of development time.
BTW: The clicks were coming from a couple of the toms (I can't remember which) after I had applied some compression. Silencing the tom track made the clicks disappear.