If he is 3 I would definitely move away from the trike. A bike with training wheels actually seems easier because of the leg position. Take him to BigW or Target and let him try the bikes there. We just got DS a balance bike that coverts to a pedal bike and after a week he can already do a fair stint with both legs off the ground. We are hoping he will be able to go directly from a balance to a pedal bike as we have heard it can be harder to go from training wheels to pedals.