Two most popular and commonly discussed here are B&W and Andersen Ultimate 5er hitch.
The notion that a hitch is a hitch couldn't be farther from the truth. Just compare the B&W to the Andersen and while both are fine well made hitches they are VERY different from one another in how they operate and have tradeoffs to consider.
The need for a slider comes down to truck + trailer front cap design + where you typically like to camp. Are you a pull through full hookup kind of guy (skip the slider...) or do you get off the beaten path and find yourself in tight situations?
Other things to consider. Is hitch weight a concern? Some hitches are very heavy (Autosliders being the heaviest) while other hitches are reasonably lite (Andersen).