My primary concern is the cargo carrying capacity of that trailer.
But, This is what I have observed.
4-Down towing, I pull in behind the motor home, Sometimes straight (once I think) usually I am either off center or at an angle, No problem as the telescoping arms are good for the error.
I put the pins in, put it in neutral or put the transfer case in neutral (Right now that is not an option) hook up all the cables and off we go.
Dolly/trailer you have to be precise or rather close to it pulling onto the dolly or trailer (This applies to both by the way until the line I will set off) You then tie the car down, You have to re-check after a few miles to insure it's still tied down.. And you have to stow the trailer or dolly when you park..
And for DOLLYs only.. You loose the effect of the rear wheel brakes on the car when stopping.
In short, 4-down way easier.