Need help understanding suspension differences

[diesel_s]

What is the difference between doing coil overs and sticking with torsion bars and keeping leaf springs in the back rather than doing a custom coil over set up as well?

 

[Elessar65]

Coilover Bible

Info here is aimed at off roading, but the same concepts apply whether you are rock crawling, pre-running Baja, getting groceries, or cruising the strip dragging your frame. To answer your question though, a lot of money.