Thanks for all the advice.
The 10mm is the winner for my purposes. On top of higher capacity, the Glock finish is very durable, even more-so than stainless steel. I haven't looked at many revolvers, but I've yet to find one with sights that I like as much as the Glock sights.
Still, I think I'll look at and maybe shoot a .44Mag before I make my purchase, but I'm still pretty sold on a 10mm Glock.