4 wheel vs 3 wheel push trolleys

Most prams are 3 wheelers these days.

4 wheels great stability, the Sn Mountain one I have folds down smaller than many 3 wheelers - the reason I bought mine was so that it would go in the back of a peugeot 306 with clubs as well.

You can let a 4 wheel go on its own down a slope - try that with a 3 wheeler and it will often tip over.

But the 3 wheelers are good also, some very good designs