I can vouch for the B&W bein' a good set up.
Beyond that . . . I've got a car hauler that pulls really well. It's a nice-pullin' trailer. For loads that fit on it (size and weight) I don't mind usin' it at all.
That said, I do love my gooseneck. On the obvious side, there's the matter of capacity for weight or for deckspace when needed. On top of that, it's a deckover which is darned handy for pallet loads (like the stepdaughter's stove pellets).
And it pulls (empty or loaded up) like a dream, and backs just as well. She once got pressed into service on short notice to take a friend's truck up to the mud runs. I was some glad to have it when it came time to get out of the parkin' area. One tight crank back (trailer bed at about a 60* angle from the back of the cab), and outta there. Part of the reward were the looks from some of the folks watchin' me get out (the folks with the ends of their bumpers puckered up into the beds of their pickups.) A nice pull and handy.
I'd use it more, but for the mileage, and this I can't quite noodle out. It's a deckover, no exceptional wind drag to it. Weighs a whisker over 5K.
I pull with a '03 Ram 3500, 6-speed, Cummins, SRW, .373, 4WD. I get 19mpg on average running around bareback with it.
I'm used to the drop in mpg hauling a box trailer because of the wind drag. What I don't get is the drop in mpg with the gooseneck hauling it around empty (again, just over 5K). MPG drops to about 15. But my carhauler on the receiver hitch and put a car on it for a 5K total on the trailer and I can still make 16-17. I can't quite figger what's making the difference. Yeah, the car on the carhauler is streamlined, but there's really not that much for drag on the gooseneck over the car hauler.
Dunno what to make of it, but if you're on that margin, it's worth thinking about.
As always, YMMV.