What do you want out of a pram/pushchair/etc?
What's your lifestyle? Do you have a car? Is the boot small? Do you walk often? Use public transport? Walk mostly in town on pavements, or rurally?
Do you plan to use slings? Do you want to carry shopping and stuff on the pushchair? What time of year are you due? Do you plan/need to go out in all weathers and temperatures or would you tend to stay inside if it's cold, rainy, or sunny? Are you wanting a carrycot for a bed at home, are you planning to travel?
How tall are you/your partner? Are other people likely to be using the buggy, are they different heights?
Are you bothered about colour options/how it looks? Are there any particular features that you want or constraints? (Budget, parent facing option, high up seat, small fold, lightweight, easy to push/manoeuvre?)
Do you like things to be integrated or don't mind a bit of fiddling about if it saves money? Are you more of an "all the features and gadgets" person or do you prefer something simple?
Should add I don't have the foggiest about what different prams there are these days
But these questions should help the pushchair fans narrow it down for you if you can answer some of them. Preferences and needs vary enormously.