DC has gone far beyond "power creep" with Superman. All their years of resetting continuity, and they've still never thought to simply run a reboot on the fifty years of making him invincible and pulling new powers out of the writers' rear.

In general, I find that DC tends to have the more interesting story setups and concepts. Marvel, on the other hand, actually has interesting characters, character development, and personality. The best character that DC has is Batman, but even that is almost completely backstory and setup, as the guy hasn't grown or changed since he was written (and any attempt to do so is either massively rejected by the fanbase, or done for the sole purpose of resetting everything, as in the awful Widening Gyre arc). On the whole, I prefer the better character work, even if the stories themselves aren't as good.

However, I've stopped following most of the comics with any degree of regularity, and have no real interest in picking them back up at all. So I'll just end with saying that at least Marvel knows how to make decent movies.