Armin Arlert vs Sparrow: who would win?

Sparrow 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+

Sparrow · Miraculous · Eagle

Tier

HIGH 7-C

Attack Potency

Large Town Level

Speed

Hypersonic, up to Ftl

Durability

Large Town Level

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