Guardian Naga vs Siren: who would win?

Siren favored — Slight edge (~55%)

Guardian Naga · Dungeons & Dragons · Base

Tier

8-C, up to 8-A

Attack Potency

Building Level, up to Multi-City Block Level

Speed

Hypersonic+, up to Ftl+

Durability

Building Level, up to Multi-City Block Level

Siren · God of War · Base

Tier

8-C

Attack Potency

Building Level

Speed

Sub-Relativistic+

Durability

Building Level

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