Bike or tricycle

Daisy

We were planning on getting our son a bike for his second birthday. When at the store we had him try out a few different ones and he's too short for the 12 inch bikes. The tricycle was just about right. I worry that he would only use a tricycle for a few months. I did find a bit of a tricycle/hybrid with 10 inch tires and training wheels. Anyone have advice on which is better suited for a 2 year old?