Double pushchair recommendations

[Maria123123123123]

I have a 4 month old and nearly 3 year old. Please can you recommend a double pushchair. Not sure if to get a tandem or double. I'm.willing to get it second hand off facebook market as they're so expensive. My brain is hurting from figuring out which to get so please help. Xx

I got a mountain duet first gen second hand so I have nothing to compare it to. It's a side by side it was heavy but easy to manoeuvre, fits through all standard doorways. It seemed narrow at first but I was still using it when they were 3 and 5! I think the tandems look harder to go up curbs. I regularly had to fix or replace inner tubes, and even replaced the tyres at one stage as it has done a lot of time and mileage!