Car Seat for second permanent car seat. What would you choose and why?

Al seats are convertible and go from newborn to 120lbs. This will not be used for a newborn and will be the second convertible seat we will be purchasing for our 2nd car. We already own one Graco 4Ever and she will soon be transitioning out of her carrier seat in one of the two vehicles, so Grandma & Grandpa can have the base Incase of emergency. Just looking for input, from people that have used or tried multiple car seats, and what their experience is.