We have both too as they have different purposes.
The roll out is on the van all the time so can't be forgotten. It is easy and quick to put up and take down, even by one person. It doesn't take up storage space in the van. It doesn't shut us off from the world when we are camping in a group. We have sides and a front if we need more protection from the elements.
The drive away we have is modern one, so in a fairly neat bag. It was cheapish (£120 new, I think). Takes 2 and a bit of bickering

to put it up. It offers full protection from the elements. It keeps the dogs contained. It can be kipped in. The loo can go outside. It will mind all your stuff if you go out for the day. It takes up valuable space in the van when travelling. It can make you feel antisocial if camping in a group but gives privacy if camping alone.
Personally we use the roll out much more than the drive away.