Car seat for VW transporter

I’m looking to get a new car seat for my 22 month old - he’s 9th centile for weight and height so no worries about him outgrowing what we get 😅 The main car we use for him is a VW transporter (with seats in the back so he’s not in the front) and also a Volvo V90 sometimes. At the moment we switch his seat between the two but it’s easy to do with his current seat. I’ve been looking at Be Safe and Axkid and am wondering if anyone has any recommendations for a seat? And should we get one for each car as I’m guessing they’re not as easy to switch? I want to ERF until 4 at least but happy to switch to FF eventually. If there’s one that’s not too bulky that would be great. Thanks so much x