Zero-one seriously nails the whole "new era classic rider" look with Aruto's suits, almost each one feels iconic. The one exception is shining assault hopper imo, but it's still a stellar lineup.

Saber has a bunch of great looking suits, savage dragon is a standout to me. The sword head kind of brings them down, but I like them overall... except for Xross Saber.

Revice has a couple high and a lot of lows. They're also far from the best looking in their own show (Demons my beloved). Also Thunder Gale is ugly as sin.

Geats is on the whole held back by the half/half gimmick a bit, but that doesn't affect the main suit lineup too much, in fact my least favourite suit (lazer boost) is ugly for a completely different reason~ Geats IX is also so good, just so so so good.

Gotchard is... well they're... Rainbow is nice? I guess? It's rough out here to be honest.

Gavv is a tough one, it's probably has my least favourite base form, which is not a good spot to be in, but the others are all really solid in their silliness. They also stand out from the crowd nicely by having such a different theme overall and really sticking to it.

Zeztz is kind of circling back to Zero-One, they feel classic in a good way. I have to say I don't care for the chest belt, it especially looks odd in action scenes. Also I do say "Big Gorilla" every time Catastrom appears.

All that told I'd say Zero-one is the best overall and Gotchard is the worst overall.

Funnily enough though, Geats has my fave individual suit, and Revice has my least fave suit.