Coil Over vs Torsion Bar
Personally, I hate them and consider the torsion bar superior.
That said, that's for a street car, more or less stock. For some applications, the tbar has to go, as it is tight under there. This is the minority of cars, but if you need it, you need it.
I think the majority of coil over suspensions are installed because people feel compelled to buy anything that fits their car without stopping to ask or understand if/why they should.
If somebody makes it, someone will install it. Doesn't matter what it is.
I'll get a million dislikes for saying that. That's how you know who didn't stop to think about it.