Undercoating Options?

While my Rubi-X is still clean and rust free underneath I have been wondering what others do, if anything, for undercoating. LineX, POR-15, PlastiDip, something else? I'm having some armor and suspension added and can coat that off the Jeep - but what works best for everything else to prevent rust, look good and potentially deaden sound? What was a real pain to put on? What actually held water between the coating and metal and promoted rust? What just didn't hold up? Any information on your experienced would be appreciated.

Ive done por15.

Here's my opinion. someone else said it in this forum. Buy small cans. This is the best advice. I just threw out half a can as it becomes impossible to seal.

As far as technique, I would say, take a weekend and por15 the whole underside every two years, depending on how much scraping you do with the underside of your rig.