I pondered the same question before purchasing our skid-steer trailer. Then decided on the tag trailer. We got a 24 foot Felling, no dove tail, but extended ramps to 6 feet,yeah 6 foot ramps. This way we can get on the trailer with no attachments if need be. The reason for the longer ramps rather than the dovetail is that we don't loose that dovetail area for loading. With a dovetail, you cannot put any materials at that last 4 feet of trailer. We haul 5 to 6 pallets of sod, salt, or fertilizer at times.
We can get our skid-steer, two buckets, forks, power-rake and auger all on the trailer at one time. The trailer is rated for 17,500 lbs. It was probably our best investment. Of course the price of $10 grand seemed mental for a trailer, but well worth it.
No experience, but loosing the tailgate access and some storage area in the pickup box, with a goose-neck, turned me away from them. We usually fill the box up with rakes, shovels, plate compactor, etc.., and I just think it would be a little more of a hassle with the neck in the way. Our pickups hold the weight of the tag trailer quite well, and when properly loaded, pulls perfect. I know, from guys who have them, that the goose-necks pull a little more stable, but for our use, freeway driving up to an hour max, or the local work (mostly)our tag hauls sweet at 70 MPH fully loaded.
Our next trailer will be a flat deck with intent of only going behind our International and a future dozer purchase.