On its face, I'd be inclined to answer the question in favor of Prince Fielder due over Ryan Braun to the dramatic difference in BABIP. During the 2007 season, Prince and Ryan had BABIPs of .286 and .367 respectively. A .367 BABIP is pretty unsustainable and that so many more of the balls that he hit dropped (or went out of the park) than maybe should have occurred, makes me think that he may have already had his peak season, unless he somehow achieves that good BABIP fortune again. Meanwhile, Fielder's relatively pedestrian (and actually below average) BABIP makes me think that had he had even average luck, his monster season would have been that much better. His LD% has also been higher than Braun's. With all that said, Braun seems to have the ability to make his hits "stay hit" as it were and doesn't seem rely solely on good BABIP to keep his batting average above normal. Ryan also slightly increased his walk rate (especially as the year went on) and really cut into his strike out rate, bringing it down to just about league average. I think there is reason to believe his BB and K rates will continue improving for a few more years and in the end I do believe he'll walk at or slightly above a league average rate. And as he becomes more selective at the plate, he'll get his pitches to hit, which we all know he does a very good job of hitting. Braun is also the more athletic of the two and the guy who should age much more gracefully, giving him a longer (healthier?) window to repeat his '07 performance. When I say "repeat" I mean a >1.000 OPS, which in the future may be less slightly more OBP heavy. Fielder's walk rate dropped from '07 to '08 and he struck out at a higher rate than he did in his first full season in '06. He seemed to be a very mature hitter when he came up in '06, sort of like how J.J. Hardy was a very mature defensively at shortstop when he came up. The question is, will he be able to mature further at the plate or will he follow in Hardy's footsteps and just settle into a nice, maxed-out groove? I tend to think the latter case is more likely. I see Fielder as a guy who some seasons could go on three or more big hot streaks and hit 45-50 bombs and other seasons only have one or two such streaks and hit 30-40 home runs, which of course is nothing to scoff at. To answer the question, I think both could easily approach and possibly surpass their '07 output in some future season or seasons. However, I think Braun is more likely to do it for two reasons: 1)Improving peripherals as opposed to Fielder's consistent peripherals (as how I see them progressing anyway), and; 2)Since he'll age better, he'll have a longer prime and therefore more chances to do it.