In "genetic" potential I would suggest that many people like nice dorsal stripes. That bodes well for the one on the left. The muted alien heads below the dorsal stripe is both aesthetic and potential, due to choosing based on making solid dorsal stripes.

For aesthetic reasons I like the head stamp and busy pattern of the one on the right.

Since you asked, I would also say, keep the one you're most happy to open the tub and see. Both are great snakes, which one makes you happiest?