I am sick and tired of your batting average driven thought process, but you're not completely wrong. Batting average is a load of crap. Never use it in a debate again in your life, trust me. There are essentially two things that are important to contributing runs for an offense, the ability to hit for power and the ability to not get out. Yes, both are persistent abilities. Derrek Lee has been better at the former than Prince Fielder, but Fielder has been signficantly better than Lee in power production. It's not as if Lee has 20 home runs to Prince's 30. Derrek Lee has eight. EIGHT. Obviously there's a tradeoff between OBP and SLG. There are several statistics that can gauge a player's contributions using both. The most well-known one is OPS, simply OBP + SLG. Derrek Lee gets beat on this metric, 992 to 925. Another commonly used one is marginal lineup value rate (MLVr). This is the basic offensive rate stat used in VORP. A watered down simple way to calculate is to use runs created for a team of 9 league average hitters (using only OBP and SLG) and then replacing just one of those 9 hitters with the hitter in question and finding the difference between the two on a per game basis. Prince Fielder beats him here: .364 to .323. A third commonly used one is EqA. EqA is found by using Raw EqA (TB+H+1.5(BB+HBP)+SB)/(PA+SB/3+CS) and putting it under several different transformations. Derrek Lee is beaten once again, .326-.319. So using three different all-encompasing offensive statistics we find out that Prince's strength (home runs) outweighs Lee's all-around offensive savvy. That said, if Lee's home run total would have been twenty and his OBP didn't slip he'd be a lot more valuable than Prince. Unfortunately Lee's OBP has been over .380 once in his career and it's sitting at .422. I'm not so sure expecting it to stay there is the smartest thing to do. Unlike Prince he's not a budding superstar at the age of 23. Adding in defense, right now they're close in terms of production. Expect Prince's walk rate to spike and then he'll certainly better. They're striking out similar. Theyre walking similar. Lee's just hit a lot more singles and has a HUGE lead in BABIP -- not something that's sustainable. In fact, the ONLY reason Derrek Lee has a higher OBP is his .406 BABIP. That's going to regress. It's an inevitable reality. Once that goes if the power doesn't come back, Lee's going to be an average to below average first baseman. That's not a typo. Prince is certainly safer.