R-System vs Demonic Beast: who would win?

Demonic Beast favored — Slight edge (~55%)

R-System · Fairy Tail · Base

Tier

HIGH 6-A

Attack Potency

Multi-Continent Level

Speed

Unknown

Durability

Island Level

Demonic Beast · Fire Emblem · Wandering Beast/Maurice

Tier

HIGH 6-A

Attack Potency

Multi-Continent Level

Speed

Subsonic, up to Ftl

Durability

Multi-Continent Level

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