Do you want a cot?
If so, how big a space do you have available to put it in? Take measurements. Go from there.
Pram - didn't buy one
Push-chair/stroller- for me, the most important aspects were ergonomic in relation to me and DH and helper
- was it light enough to carry up and down stairs (to MTR, to supermarkets, etc.) easily
- were the handles a suitable height so we did not get back strain from pushing (I've had taller friends who complained that low handles gave them lower back strain)
- does it fold up easily to get in and out of a minibus, bus, or taxi? One handed is best.