Which double pram to buy??

There was 17 months between my 2 terrors. The baby was born nearly a month early and was tiny, my son was huge!!!!

The first double pram I bought was a Graco tandem with a car seat for the baby. This was ok on the flat with no kerbs to go up, but with my large toddler in front I had trouble going up kerbs and the amount of people I ran down going round corners was embarassing. Plus with the baby being so small I wanted her to be comfy so never used the car seat on the pram.My mother couldnt steer it or again get it up kerbs

The next one I bought was a Mamas