Which is best for 3babies/kids?

So I have a 4yr old, 5m old and I’m 2m pregnant 🫠

I’ve seen these wagons and I like the idea of everyone being in one thing, especially since my oldest still likes riding in a stroller BUT they seem absolutely massive and almost too bulky. It will literally take up almost all my trunk space and I would have to get one that has a car seat attachment option for the newborn while the other two sit in the wagon.

But then there’s the mockingbird stroller that a lot of my friends have and it looks awesome! I know it has so much storage space on the bottom which is great since I’m gonna need a fat diaper bag for two littles now. But I know that only has 2 seat options I think and then like a riding board for the oldest.

What do you think is worth the investment based on personal experience?