It depends on a couple of things, though. If you could pick either player in retrospect, then for certain you'd take the .300/.350 guy over the .280/.350 guy; especially since the .300/.350 guy is much more likely to have a higher SLG than the .280/.350 guy. However, if you look a bit deeper into the numbers, there is something to be said for plate discipline and the ability to repeat numbers. While some guys have a bit easier time repeating batting average than others, the numbers tend to fluctuate year in, year out. However, IsoD and plate discipline are much easier to repeat and erode much less with time. In other words, the .280/.350 guy is much more likely to be more valuable and productive in the future than the .300/.350 guy. The .280/.350 guy is much more likely to have a clue at the plate than the .300/.350 guy. Is there a study that back this up? A hit is worth more than a walk. But the walk is more repeatable/predictive than the hit. In a vacuum .300/.350 is more valuable than .280/.350, but because of defenses and luck(i.e. BABIP), the .280/.350 is more likely to continue to put up a .350 OBP(or just the better OBP of the two players) than the .300/.350. If you're just taking that in isolation though, wouldn't the hitter with .300/.350 be just as likely to hit .320/.370 as .280/.330? I agree that the hitter who is the .280/350 guy is more likely to put up a .350 OBP, but I think that the higher average guy has just as much chance of having a higher average the next season as having a lower one. The likeliness of a player getting a certain AVG then delves into batted ball types, defense, and luck. Needless to say, there's more room for luck to be on your side when you're hitting .280 than when you're hitting .300. Simply put, you're a better bet for a higher OBP if you have the better IsoD, because it's much more predictive than AVG. That doesn't make sense to me. It seems that you are saying the patient batter has a better chance at a higher OBP because it is easier to predict.