As all the guys have said : There ARE Pros & Cons to both ….. Myself I would only have the King-Pin 5th Wheel style ….. The idea of having the fold away ball is nice BUT a Pain in the A** to hook up … especially if its done in a most repetitive way like 4-5 times a day …. The way I see (and have experienced it) is this …. (based on the OP's p/u with a box Not an open Flat-deck)
With the ball set-up getting it just right, unless there is a camera in the box, you better have a good guess or a spotter (you better have dry-box insurance for those over shoots …lol) ….. then there are the safety chains to hook up (Mandatory by Law) …. to get my Sorry A** over the side of the dually fenders ….HMMM ???…..Nope !!! …. especially in the winter or in the dark of night to hook up the chains and do up the coupler or in the winter when the flip over pin was down and now froze in a block of ice ??? ….. anything at all that is on the deck in line with the ball WILL get hit … you are forever cranking up and down on the landing gear to raise and lower the coupler onto and off the ball ….. Uhh !!! ... when that trailer is loaded, and Nose heavy as they are always it'll only take a few times cussing up a storm to make you think WTF did I Buy !!!
The fifth wheel King-pins Hitch's are not perfect either if the Hitch is a stupid RV style, with the sliding bar and NOT Jaws !!! …. just ask me I'll show pics of the damage when the sliding bar never latched/locked 100% ….. even tho it appeared to be latched it worked its way open and crash out it came and almost thru the box floor and screwing up the box side rails too !!! …. I went thru some T & E until I got the last hitch a #24,000 from "Curt" …. it is a double Locking Jaw style almost exactly as the Holland Fifth on our Semi's …. it has a 4-way rubber cushion mounted Head that pivots side to side as well as forward and back as they all do, so hooking up a little ****-eyed is NO Problem… it also is the model that I can slide the pin setting forward or back to add or remove weight off of the steering …. removing the trailer fully loaded as I am all winter (I tow a 20'+5' flip down ramps, 12 ton tandem dually equipment trlr with my #10,000 Bcat, 8'-snowblower, 8' 4-n-1 bucket and a Blizzard 8611 snow blade … all on deck), is a piece of cake, just crank down the legs, take up a bit of the weight, reach over the side of the box pull the lever/latch and pull out …. (ohh and yes and both styles, all have elec cords and saftey breakaway cables to unplug first … lol) …. I store shovels, chains, chinch's, ratchet straps all on the box floor behind the wheel with a 5th wheel tailgate so I don't have to open and close one either ….. so when it comes time to hook up again line it up back in and Click it's auto latched, I carry a combo dry-box and 100gal fuel tank in the front of the box (it's never been crashed into with an over shoot) ….. the King-pin height is the same height as a semi's and is also the same size, so I switch from using the dually Dodge to hooking up onto the Louisville Ford L-8000 it's both an identical configuration ….
So in my world it works the best and simplest for what I do ….. JMHO …. another point of View ….. Cheers !!!