Capsules are the best in winter or cold weather. You put the baby in the capsule inside where it's warm, snug them up in their blanket, etc, then transfer straight out into heated car. With a car seat you have to unwrap them in the cold in order to do buckles up. Big consideration here where we have sub zero temps.

Carrying the capsule after a few weeks should not be a big deal for you if you have a normal CS recovery. I was able to carry ours around (with our increasingly heavy baby LOL) at week 7 - even though I'd had a post-op infection that set me back by a month or so AND residual pelvic instability pain. I could carry the capsule better than I could get the pram out of the boot.

I suggest hiring one if you can. Bub will be in it for 4-6 months (or a bit longer if they are small) so this is most cost effective way of doing it. The one we hired was brand new anyway.