I think Prime 2 is my favorite but Super and Samus Returns are close. Dread is definitely my favorite of the non-standard designs.
It's beating a dead horse by this point but Other M's is so, so bad. It's even worse in context because Samus clashes so hard with everything else in the game. Like any of the shots where she's standing next to Galactic Federation troopers or Adam or MB or whatever just look terrible. She looks like a toy. It also led to us getting one of the worst Amiibos of all time when it came to her Smash 4 incarnation (seriously what the fuck is going on with that pose?). They made a couple tweaks in Ultimate that made it look better but it's a shame that it's still so closely tied to Other M's look.
It's beating a dead horse by this point but Other M's is so, so bad. It's even worse in context because Samus clashes so hard with everything else in the game. Like any of the shots where she's standing next to Galactic Federation troopers or Adam or MB or whatever just look terrible. She looks like a toy. It also led to us getting one of the worst Amiibos of all time when it came to her Smash 4 incarnation (seriously what the fuck is going on with that pose?). They made a couple tweaks in Ultimate that made it look better but it's a shame that it's still so closely tied to Other M's look.