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They all have different features, and over the years, I have found I prefer the ones that go under, not on top. I also like the feature where you have molded in sections to put a board in, to kind of keep your load where you want it. Make sure to get a cover for the tailgate, it won't keep the gate from being bent, but will save a lot of scrapes and scratches
I used the cheap self spray in bed paint on my 86, it looked great, but wound up being no more than heavy paint. I've not tried the roll in, and would be interested in how it turns out, and holds up.
I'm a firm believer in "you get what you paid for". With that being said, Line-X and forget about it.
I have no personal experience with the roll-in, but seeing a friend's CJ-7 with the cargo area rolled, that peeled 2 years later, I don't trust it.
It's all about prep. If you don't prep it right, doesn't matter what you put on it, it's going to come off. Most of what you pay for with a Line-X dealer is the prep time. Only takes about 5 minutes for them to spray it.