Compared to any of the traditional stats, OPS is the greatest thing since sliced bread. It just underestimates the value of OBP. wOBA properly weighs the value of batting events (out, HBP, walk, single, double, triple and HR). Obviously, that is not going to be available at the park but it's roughly proportional to 1.8 x OBP + SLG. If I'm comparing two players, I look at the difference in their SLG and add that to twice the difference of their OBP. So again, roughly speaking, these two players are fairly equal in terms of their impact on team runs: OBP / SLG / OPS.375 / .400 / .775.325 / .500 / .825