Westbrook is not a great finisher. People confuse ferocity and power with actually finishing. Westbrook has HORRIBLE finishing fundamentals and relatively hard touch around the rim. It's people like this that think Westbrook is a better finisher than 5'9 Isaiah Thomas
Curry has a much larger variety of finishes around the room and much softer touch. Plus, his finishing fundamentals and ability to instantly balance himself (On finishes or shooting) is elite.
He's easily comparable in transition to MVP Rose and Walll. His three point shooting, great finishing, insane vision, and creativity with passing makes him just as effective as Rose and Wall's sheer speed and ability to attack.