Astel vs Rahi Nui: who would win?

Rahi Nui favored — Slight edge (~55%)

Astel · Elden Ring · Base

Tier

7-A, up to HIGH 4-C

Attack Potency

Mountain Level, up to Large Star Level

Speed

High Hypersonic

Durability

Mountain Level, up to Large Star Level

Rahi Nui · Bionicle · Base

Tier

7-A

Attack Potency

Mountain Level

Speed

Massively Hypersonic+, up to Relativistic

Durability

Mountain Level

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