I prefer tow bar mounted racks. Most my friends run Thule roof racks which are quicker and easier to use but affect fuel economy. They also leave them on their car all the time which to me highlights that they have bikes in their garages.
I have a Mottez rack, it’s a 4 bike rack but only ever fits 3 at a push. Some axles and wide bars can rub on forks and saddles etc causing a bit of damage. Tow bars on some modern cars can be really expensive. It has two holes that you can fit a padlock through to secure the rack to the car, but nothing to secure bikes to the rack. It uses toe straps to hold the bikes and the wheel channels wont work with plus tyres and have cracked using mtb tyres. My old one used to fold up when not in use.
My van won’t take a tow bar due to a wheelchair ramp so i’m going to look at making some brackets to fit a thule roof rack to the back