Wither Storm vs Ke-Pa: who would win?

Ke-Pa favored — Slight edge (~55%)

Wither Storm · Minecraft · Base

Tier
7-C, up to HIGH 3-A
Attack Potency
Town Level, up to High Universe Level
Speed
Athletic Human, up to Subsonic
Durability
Town Level, up to High Universe Level

Ke-Pa · Kung Fu Panda · Dragon Form

Tier
7-C
Attack Potency
Town Level
Speed
Supersonic+
Durability
Town Level

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