I only started to browse but feel so confused already!

Seems like it's good to get the "system" with the car seat, base & stroller so it's easy to just pick up the car seat and snap it into the frame/base when getting out of a car.

But it seems like the systems aren't as portable as let's say a City Mini that you can fold up. What are the pros/cons of both? Why did you pick what you did?