I got a second hand 4 bike Buzzrack a few years back and don’t see the need to upgrade (other than to maybe get a tilt function). With some preplanning I find we don’t need to access the boot too often. And when it’s critical we can send a ‘small’ in there with the back seat down but it happens very seldom.
A universal complaint is that you can’t easily fit the number of bikes a rack is designed for on the rack. Not if you care about rack rash and components getting buggered at least. We used to take best part of an hour to get three mountain bikes on a four bike rack and had to adjust seat post heights and move handlebars. Even after setting it up so we knew what went where.
So. Got a Thule Freeride and modified the fittings to fit on the roof rack. It’s a cage type rack so not just two bars. Now we load one on the roof and the other two in positions one and four on the rack. It’s a bit of an overkill but we’re on the road in five minutes and there is no chance of any of the bikes touching each other. Extra bonus is that we have space for mates bikes when needed.
Good luck and let us know what you decide on in the end.