I have both a 3 wheeler & a 4 wheeler pram.
My 3 wheeler is a Phil & Teds Sport & I love it, it's never tipped, even at the easter show when we had heaps of showbags hanging off my mummy hook on the handle & my daughter wasn't in the pram! It's light & manouvers fantasticly.
My 4 wheeler is an Emmaljunga (similar to bathshebas) & I love that one for different reasons. The big wheels means it moves well over rough ground, I call it my 4WD pram LOL, it's big & comfy for the baby & has great suspension. To top it off it looks fantastic!
To be honest, I prefer my Emmaljunga for newborn while using the bassinette attatchment & the P&T's for toddler & up. The main reason being is the convenience of the P&T. It's so light, folds so small (compared to most & takes up a fraction of the space in my boot the Emmaljunga does) & it's so easy to push & manouver.

I know I was no help at all I'm sorry. I have heard great things about the Swallow Beema Q range though, that would have been my 2nd choice 3 wheeler after my P&T's.

Good luck choosing, it's a big decision