I DON'T have 24"s (still have the factory 20"s), but want them. My buddy, who owns a wheel store, has 26"s on his Escalade. He has rubbing when he turns the wheel too much; but, he owns a wheels store (and sells wheels right off his truck), so the 26"s are great marketing, and he's willing to live with not turning too sharply/rubbing. I am NOT willing to live with those things.
Assuming the 24"s wouldn't rub like the 26"s, the choice is easy for me. Whereas the 26"s may look better, they're heavier, hurt braking, and can rub more.
I can't go on looks alone as far as wheels are concerned.