The developer says on the official Roblox page that all styles are intended to be viable; rarer styles are described as cooler, not guaranteed winners. Practice matters more than a fabricated tier rank.
Compare a style by testing your light and heavy punch timing, dash recovery, blocking and stamina use against different opponents. Learn one style well before spending spins to switch. The official controls list Space to dash, F to block, mouse button 1 for a light punch and mouse button 2 for a heavy punch on PC; a heavy-then-light input performs a feint. Xbox controls are listed on the game page.
Update labels such as Surgeon or Deimos can change. This guide does not assert unverified meters, transformations, damage values or roll odds. For a new style, read its current in-game description and try it in matches before relying on an old video or tier list.