[2wheelsx2]

Depends on what you are going to be using your truck for.

Dropin liners are good in that you can slide heavy loads in, and push them around, but then they have to be tied down.

Spray in liners look good longer, won't abrade the bed and cause rust, don't take up as much room in the box, but are "grippy". This is good and bad. You don't need to tie down as much, but if you are trying to shift a heavy load, you have to lift it, instead of sliding it. And it's pretty much permanent.