Rebellion (Undead Unluck) vs Mod: who would win?

Mod favored — Slight edge (~55%)

Rebellion (Undead Unluck) · Undead Unluck · Base

Tier
HIGH 7-A
Attack Potency
Large Mountain Level
Speed
Hypersonic+
Durability
Large Mountain Level

Mod · Nanatsu no Taizai · Base

Tier
HIGH 7-A
Attack Potency
Large Mountain Level
Speed
Sub-Relativistic
Durability
Unknown

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