I was looking at these on the weekend and there was a strider specialist from Steelcraft there. She said that they were each as stable as the other, but some people find the 3 easier to manouvre. Makes sense as the front wheel on the 3 was much bigger. I think it would be better as a walking pram.

I think the basket on the 4 was bigger.

I'm pretty sure that the capsule fit either the 3 or 4.

I'm trying to make up my mind about buying one and it is hard! Why are there so many options?!