Felix is getting a ton of minutes and plays a far larger role than Gathers.
Felix is getting those minutes because Kabongo is out. Long term, a distributor that can run an offense has more upside than a 6'6" PF in an offense with a bunch of longer guys. So I expect that Felix will have a bigger long term positive effect on Texas than Rico will for Baylor.
Felix's ceiling is higher because he can always improve on his offensive game, his floor vision, and his decision making. That gives him the edge over Gathers, who will not have the ball in his hands on every possession over the next couple years.