I've had an Atera Strada for about 3 years now, but not owned one before that, so other than comparing it to friends who have all gone for Thule racks, my opinion could be limited here.
One thing to think about is the weight of the rack. The Strada is 14.5kg before you add the extra fitting for the fourth bike. The Buzzrack one is 19.5kg. So, probably not a huge difference between them, but still worth checking what your car can take, as once you add in the weight of all the bikes, that can be a big lump hanging off the back of the car. It's also worth noting that there is no way Mrs B would be able to lift the rack, and set it up on the car. The weight of it is one thing, but also how you have to hold it over the tow ball.
I've found the Strada to be ok, but I really need to take my time getting it set up with whatever bikes I need to carry. 2.5" tyres are a pain, as the wheel straps are not overly long, so you need to either let some air out, or push down on the wheel to get them to clamp. Likewise, mountain bike frames are generally wider than road bikes, and I have to use cut up pieces of foam to pad between bikes. A wider/longer rack would possibly overcome this.
Things I really like about the Strada are the tilt/slide function. It is really simple to slide it back (even with bikes on) to open the boot. I've seen others really struggle with Thule racks which do not have this as well designed.