I am looking to upgrade my tires this summer when I do my lift, and am getting some preliminary pricing stuff done. Is there any reason to stick with a 15" tire versus a 16"?

I have seen both 15x10 rims and 16x10 and I plan to run a 35x12.50x15 or 16. Aside from the price difference, is there any thing I should be concerned about? Fitment issues? Thanks.