Upgrade tires

Hi, I am new to the four wheeler scene and been researching about rims and tires. I recently bought a four wheeler for me and the little brother to start working on for him to ride it has a 2 inch lift and 27x9x12 front and 27x11x12 on the rear. I am looking at 14 inch wheels with 28×9.5 all the way around or 28×9.5 on front and 28×11 on the rear. My question is being bigger rims will it effect a whole lot? Like i said this is new to me so some opinions would be great. Thanks for the advice