Knuckle Bine vs Grunbeld: who would win?

Grunbeld favored — Slight edge (~55%)

Knuckle Bine · Hunter x Hunter · Base

Tier

8-A, up to LOW 7-C

Attack Potency

Multi-City Block Level, up to Small Town Level

Speed

Hypersonic, up to Hypersonic+

Durability

Multi-City Block Level, up to Mountain Level+

Grunbeld · Berserk · Base

Tier

8-A

Attack Potency

Multi-City Block Level

Speed

Massively Hypersonic

Durability

Multi-City Block Level

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