Superglide for me. One thing to keep in mind. The Superglide can only turn as far as 90 degrees. A manual slider should allow you to go beyond 90 degrees. The only time I have ever gotten close to 90 degrees was when temporarily parking the whole unit in a site and I had to have the truck turned sideways so it was not blocking the roadway while waiting for the proper site to clear. Some that are not so good at backing will see 90 degrees almost every time they park their trailer.
I also got what I believe at the time was called a super rails package. Basically it lets you pull 8 pins, lift out the hitch, and with a quarter turn of the four through the beds posts you are back to having your truck for non camping use.