Vampire Plant vs Bjorn: who would win?

Too close to call

Vampire Plant · Godzilla · Base

Tier
9-C
Attack Potency
Street Level
Speed
Immobile, up to Peak Human
Durability
Street Level

Bjorn · Vinland Saga · Base

Tier
9-C, up to 9-B
Attack Potency
Street Level, up to Wall Level
Speed
Unknown
Durability
Street Level, up to Wall Level

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