We are fans fo PSB, and if you've got a princess-crazed little girl, you might want to do both (congrats on scoring CRT, BTW). IMO the food is better (verging on great actually), plus it is very convenient for us, owning DVC at BWV, so walking distance (and it's such a lovely walk before the park opens). Having a chance to interact with Jasmine and Mulan, plus we had Aurora, Snow White and one other, perhaps Pocahontas.
Hey, if you can get it, try it. It is kinda hard to beat the whole dining-inside-a-beloved-landmark thing that CRT offers, but we really liked PSB too. And I think the character interaction was nearly as good as at the slightly more intimate CRT.
Good luck!