Field Researcher vs Nanomech: who would win?

Field Researcher favored — Slight edge (~55%)

Field Researcher · Godzilla · Base

Tier
9-C, up to 9-B
Attack Potency
Street Level, up to Wall Level
Speed
Athletic Human, up to Supersonic
Durability
Athlete Level

Nanomech · Ben 10 · Base

Tier
9-C
Attack Potency
Street Level
Speed
Average Human
Durability
Below Average Human Level

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