The problem with conundrums like this is that personal opinions, feelings, desires and abilities drive individual decisions and my decision and reasons behind it may not match your abilities, desires and preferences.
I have never considered the need for an air type setup. My last 5er of 9 years and 40,000 miles had a plain old pin box and my Pullrite slider. I was never dissatisfied with that setup, but we did have chucking from time to time. That is why I ordered the Moreryde pin box on the new one after reading good feedback on it. Only took the trip home from the dealer so far, but noticeably smoother, but I'm guessing not air ride smooth. Here, my expectations are different than yours. You really have to decide if smooth is ok, or if air ride smooth is needed to make you happy.
Same thing applies to the slider vs no slider. I'm the type that would get impatient turning around or backing into a site at 2am after driving for 14 hours, with DW being grumpy with me, two kids begging to get into the camper to sleep and a dog whining and let my guard down and hit the cab corner. Oh, and it would be raining cats and dogs too. But we back into sites that most people wouldn't consider trying to get into either. So I'm constantly pushing it close to the edge. The Pullrite was a bit more money and a few more pounds, but something that did the job without thought our input from me.
If your travels take you to a lot of pull through sites, larger more spacious campgrounds and with a driver that is always observant and avoids shortcuts (and doesn't push the driving as far as I do) then you may not need one. I wouldn't expect that you can turn sharp enough driving forward to hit (but I don't know that for sure). I'm sure others could confirm that.
If you are constantly getting sites that take a lot of jockeying our sharp turns to back into, or in really tight areas and campgrounds, a slider of some type would probably make sense. If your driver would always think to deploy a manual slider, no matter the situation, a manual one would likely work for you.
This is the best way I know to answer this for you as everyone will mostly recommend what they do. Giving you why I chose what I chose helps you match (or not match) your styles, abilities, etc to mine to see if you feel I'm worth listening to. It's ok if you determine that I'm not worth listening to. We are all different and experience different situations that require different solutions.
Just listen to the "why's" behind what they do and find what you fit into and will be comfortable with! And remember, none of this is permanent. You may lose some $$$ in the process, but you can always change if you made the wrong decision.
2016 Jayco Eagle HT 29.5BHDS (ordered 12/30/15, delivered 3/8/16)
2015 F-350 crew cab, short bed, 6.7L PSD, Pullrite Superglide 3300 hitch