I didn't need to do any research here. One of these guys is very good, the other might be good one day, but still a bit green. Julius best skill is his grappling and he won't be the better grappler here. Yakhyaev is the pick and likely wins by finish.

Abdul Rakhman Yakhyaev

AbdulRakhman Yakhyaev is a solid prospect who can wrestle and strike. He has fantastic takedowns with everything from body locks to actual shots. On the feet he has great power and throws in combinations. He doesn't have a ton of volume but he does have accuracy and a solid chin. When he gets takedowns he throws out strikes and will snatch up submissions. Overall he is a well rounded guy with finishing upside. He is coming off the fish win over the very finish able Brendson Ribeiro

Julius Walker

Julius Walker has only been fighting professionally for 3 years and it shows. He can end up in bad positions at times and is then forced to rely on athleticism to get through. He is defnitely flashy and has some power. There are some holes in his takedown defense, but he is defensively sound enough to avoid easy submissions. He has solid offensive BJJ and is very capable of finding something in a scramble. But while he has decent grappling, it is not going to work for him at this level. He is coming off the KO loss to Dustin Jacoby.