Only way to know is to point some hashpower one way, some the other way, wait at LEAST a week, and compare payout per hash. I was getting less here than I would mining just LTC at a zero-fee pool, so I pulled some hashpower from here and am doing my own comparison right now. My rigs have separate addresses so it's easy to compare. You have to give it at LEAST a week due to variance at your hashpower rates. Too much luck/noise otherwise.