My twin Aria could go through my living room door (standard size) but it was very flimsy and difficult to push. Also the seats were very narrow which is something to consider, my two were newborn and 18 months and DD1 was a very small 18 months but looked squashed in the seat, she used to elbow the baby for more space.
If I HAD to get a side by side I would get something with air tyres for definite.
But for me it has to be Phil and Teds all the way sorry