HELP: type of car seat

1. A car seat that clicks into a base. So husband and I could each have a base in our car and easily switch the baby from car to car. BUT would have to buy a new one once they get to be about 30-35lbs or 30”

Or

2. A forever car seat that converts through all stages from newborn to toddler and we would never have to buy another BUT is a tough to switch cars and cannot be carried like in stores and houses and stuff. You have to take the baby out when you leave the car, etc.

THANKS