Best Tiger vs Ginshi Shirazu: who would win?

Best Tiger favored — Slight edge (~55%)

Best Tiger · Invincible · Base

Tier
9-B, up to HIGH 6-B
Attack Potency
Wall Level, up to Large Country Level
Speed
Massively Hypersonic+
Durability
Wall Level

Ginshi Shirazu · Tokyo Ghoul · Base

Tier
9-B, up to 8-C
Attack Potency
Wall Level, up to Building Level
Speed
Supersonic
Durability
Wall Level, up to Building Level

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