Well, I won't get too far into this debate, but I'll say these two things:
1) Bynum is very good and makes Philly better than just with Iggy. But they also lost Williams and Brand this offseason. I think the Sixers future potential is much better now, but they have a ways to go before they are contenders. In the absolute best case scenario for them THIS YEAR, they become what Orlando was a couple of years ago: a top 4 team that really isn't good enough to win it it all. That is a team we should be able to take care of.
2) I tend to think that Howard is better than Bynum, but I think the OP is right at the very least in the sense that it's closer than many people think. Bynum is probably a better offensive player than Howard. If that's the case, maybe we should calm down a bit about the Lakers. I think Howard helps them, but probably less than most people think. If they weren't guaranteed to win a title with Bynum there, they aren't guaranteed to win it with Howard.