I'm getting mixed info on what is a better product POR 15 chassy coat black or using a 2 part epoxy paint for the underside, sub frame and engine compartment. what is the best product?

Topoff 68

You may want to add one more option...powdercoating. I PORd the underside of the floorpans, intend to powdercoate sub, innerfenderswells, rad supports, etc and paint the firewall