Need opinions on what to buy.

Virginia
So we bought a convertible car seat for our first born for the fact it was easier and I could also wear him where ever I went with my baby carrier. I loved the security and knowing he was warm and safe. I had an infant carseat if we needed it. It was about to expire then we bought the convertible just in time. However we are expecting our next baby boy. I'm stuck between buying an new infant car seat that can attach to my double stroller or buy a convertible to not worry about buying a new one. I feel like buying a infant would make things easier on me because my first born won't be able to walk yet (or so we think because he will only be 11 months old but wants to walk at 8 months). I'm torn so I need some other mommies opinions please. Thanks gals.