It depends on what you want to eat! I always go to Pizzafari when in the Anmal Kingdom because I love their Hot Italian Deli sandwich. I've never tried their pizza. I think the pizza at Pizza Planet is just so-so - but it's a cute place to eat your meal.
I agree it depends on what you want Pizzafari has pretty good sandwhiches but their pizza reminds me of those little cheap frozen pizzas I think they are called G&W? Pizza Planet had pretty tasty pizza, we really liked it..