If you have a puck system or 5th wheel prep then go with one that matches up to your system for ease of install and removal.
If not then as mentioned there are many options out there. Do you have a Sidewinder/Revolution on your unit from the factory? If so then no need for the slider.
My hitch is a Reese Elite head which has a one piece cast iron jaw vs the plate system of the less expensive Reese heads. Reese makes a good product regardless of model, just opted for the upgraded head on mine. Since I have never used a slider I have no opinion or experience to share. Consider weight as well in your choice as you will have to move it.
Another thing I would suggest is a bed mounted pigtail. You can hang it over your tail gate, but I feel the bed mounted ones have less a chance of hangup.
2014 375 BHFS Eagle Premier
2014 Ram 3500 Longhorn DRW CC
6.7 CTD, Aisin, 4.10's