Armin Arlert vs Kamen Rider Zanki: who would win?

Kamen Rider Zanki favored — Slight edge (~55%)

Armin Arlert · Attack on Titan · Titan Form

Tier

HIGH 7-C

Attack Potency

Large Town Level

Speed

Subsonic, up to Supersonic

Durability

City Block Level+

Kamen Rider Zanki · Kamen Rider · Orochi Phenomenon Arc (Episode 40 to 48)

Tier

HIGH 7-C

Attack Potency

Large Town Level

Speed

Supersonic+

Durability

Large Town Level

A heuristic estimate from normalized VS Battles Wiki stats: tier, attack potency, speed and durability.