Well, I haven't had any experience with Qwikliner, but both the Rhino and Line-X liners are good.
I am a heavy equipment operator for a small Milwaukee suburb and have had liners sprayed in some road construction trucks. These trucks have seen hot summers, cold winters, salt, snow, concrete, cold patch, metal barricades etc. We have had spray-ins from Ziebart, LineX and Rhino
The Ziebart liner we have in a truck was crap. It peeled badly, and is currently looking like utter s!@# in the bed. It wasn't a Rhino, but their "house brand" Z-liner. I believe the prep was also to blame.. they probably just did a quick scuff and shoot.
The Rhino Liner is very good and is a hard rubbery material. Our 2 trucks with it have been holding up very well. There is some minor chipping, but these trucks see some serious abuse. The only thing I don't like about the Rhino, is that sharper objects can cut into the rubbery coating to start a chip. We use barricade flashers alot in our trucks and the angle iron legs can dig into the liner.
The Line-X is my favorite. It is a hard plastic like material. It has favored the best in the trucks that I have seen (although I believe it costs the most). Unlike the Rhino, you can't dig your fingernail into the Line-X. The only thing I don't like about the Line-X is that the bed can be more slippery than the Rhino when wet. This can be a problem depending on what the truck is used for.. We have a truck that holds a 200gal tank for tree/plant watering and the bed/tailgate is slick when its a little wet. Just a slight disadvantage, but IMO the Line-X durability is the best.
As far as cost, they all should be pretty comparable, but don't let the cost be too much of a deal breaker since it's permanent. I would spend the money and do it right the first time instead of being stuck with a liner you don't like, just because you saved a few bucks. Hope this helps, our Line-X location has been in business for years and the main guy has done thousands of liners, don't be afraid to talk with the guys and pick their brains. Stop in and see what kinda work they put out.
Good luck.