Taotie vs Grave Buster: who would win?

Taotie favored — Slight edge (~55%)

Taotie · Toaru Majutsu no Index · Base

Tier

9-B, up to 8-C

Attack Potency

Wall Level, up to Building Level

Speed

Subsonic

Durability

Small Building Level

Grave Buster · Plants vs. Zombies · PvZ1 - PvZ2 (Level 1)

Tier

9-B

Attack Potency

Wall Level

Speed

Immobile, up to Average Human

Durability

Large Building Level

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