I am definitely biased toward the Sidewinder. Have had them on two different fivers. Once installed, you never have to worry about tight turns again. You can use a basic hitch (100lbs or lighter). You can turn your hitch out of the way when unhooked. The fiver follows closer to the same path the truck does. Backing seems easier to me as the fiver responds faster. You can get the airborne version to easily incorporate air ride.
The reasons I don't like any kind of slider are: they are heavy and difficult to remove, they take up an inordinate amount of truck bed room, they seem to bind when you need them most, as in very unlevel backwoods situations. I don't miss the ones I had at all and will never have another one.
Check out all the videos and writeups on both options and make an informed choice for yourself.
Good luck and happy camping!
Scott and Liz - Southern NM
2012 Wildcat Sterling 32RL - w/level up (best option ever)
2007 Chevy 2500HD 4dr short bed Duramax w/allison
Reese Fifth Airborne air ride king pin coupler with Sidewinder