In the market for a new double stroller and I'm feeling overwhelmed with all the options. Help, please!

Currently we have a Britax B Ready and it has certainly served us well over the past few years. But we have a third baby now and we need something different because we can't add a glider board or put on a third seat. I have considered trading in for an Uppababy Vista but my older kids have started fighting over the seats and prefer to sit next to each other.

Ideally we want a side by side stroller that can fit through doorways, can attach a glider board, and is able to work on uneven ground. And if it's a popular model that can be found used, even better! We have a Britax car seat so added bonus if it's compatible, but not necessary.