Infant or convertible car seat??

Shelby🍍
Ok so I'm navigating all this for the first time and have gathered that the main benefit of an infant car seat is the travel system and for the convertible it's its longevity/frugality. Knowing that, is it more *practical* to get an infant seat for the travel system? Or would I be better of with an convertible and just using the carrier or wrap whenever it's time to get baby out of the car? I'm also considering how this factors into purchasing a stroller re the infant seat. Help! This is all so confusing!