Best convertible car seat to use for newborn until as long as possible?

La

Hey everyone, my LO is currently 1 year old and I am 7 months pregnant. He is still using his carseat that came with the stroller, but once the new baby arrives we will sell that stroller/car seat combo and buy 2 car seats and a double stroller.

Can anyone recommend a good convertible car seat that will rear face and eventually front face, ideally that is compatible for the both of them so we can just buy two of the same?