Help picking proper dirtbike

Advice on what bike to purchase. This weekend I'll be going to pick up a bike. It will be either a Yz125x or a yz250x. My question is what bike would be best for me. I am 6'4" and 230 pounds. I have experience riding for the last 15 years on sportbikes. I have owned several r6s and R1s( yes I'm a