The rear facing ones are supposedly considerably safer, and I can see why. However there is a catch in the case of ours – the flippin thing is so big an adult can’t sit in the seat in front of it. It’s an Axkid Duofix. It has a lot of baby leg room though so I really can see our boy staying rear facing for years.
This does clearly depend on the car. Even in a Mondeo the seat in front has to be too upright for my liking. And I’m short. In a Nissan Qashqai (God awful car anyway) you won’t get an adult with legs in front of it.
It is also attached to the seat in front using tether straps. So it takes a bit longer to swap between cars than those without.
A friend has the Cybex Sirona which, although pricey, is not that much more money and looks far better quality, plus it swivels. Worth a look. Less kid leg room but looked like ok front seat room in their 3 series.