My DS is turning 4 soon and we'd like to get him a bike (he'd like one too, and excitedly shouts 'BIKES!' in toy shops etc. He's already got a balance bike, but just doesn't 'get' it at all, he can't manage staying upright, balancing AND steering, so we're thinking proper bicycle with stabilisers, or a sturdy metal trike.
What would you choose for a child this age?