Tywin Lannister vs Nanomech: who would win?

Tywin Lannister favored — Slight edge (~55%)

Tywin Lannister · Game of Thrones · Base

Tier
10-A, up to 9-B
Attack Potency
Athlete Level, up to Wall Level+
Speed
Athletic Human, up to Subsonic
Durability
Athlete Level, up to Wall 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.