kmc xd137

Hi everyone, I'm new to this site and it's my first Jeep. I have recently got a new 2020 Jeep Wrangler Unlimited Rubicon. I'm in the process of buying new wheels and tires, I've done a research and came across the KMC XD137 FMJ, the question is.. should I get the (20x12 -44") or (20x10 -18") I...