Line-X is best and worth the extra. It is a "hot" process and the others aren't.
I guess it really depends, no argument from me that it is a good product, whether it is worth the extra depends on the use case.
The only liner I have damaged is Line-X, to be fair what I did probably would have damaged any other liner too. To me it looked like crap after it was repaired, not that it really mattered, it was a truck bed.
For the normal truck person any of them are fine IMO they are all pretty tough. Plenty tough for the occasional lumber, bags of mulch, etc that will be hauled there. So IMO if you are not hauling engine blocks(how I damaged Line-X) there really isn't any justification for the additional cost.
I think the $$'s saved on the liner would be well spent on a bed cover.