What size cult badboy?

im 6'3"ish and i ride a 20" and i feel comfortable even tho i slammed my knee into the handlebars the otherday i just want to know more about the 21" and 21.25" what should i go with is it gonna be like learning to ride/jump again or will it be a little weird but pick it up fast. also will it be harder to kick a tailwhip i have never seen a 21" or 21.25" all of your info will be much appreciated thanks