The Rival stats are the best for me.. Very easy to understand and use with lots of reports to get the information I need.
PLUS – I love being notified of new players and new deposits! It’s like Christmas for Adults 
Rival could use Referral URL, though… That would be great. I like Brightshare stats also, but Rival’s still top theirs. CR are nice as well, but don’t seem quite as well put together (to me).