What is the "better" type of auto gearbox for towi

Go for the Ford Kuga Titanium 180PS. It has 6 gears changing through 2 clutches one does 1,3,5 the other2,4,6. Its so smooth, I can only tell sometimes, even when towing, that it's changed up or down, by the rev counter. I tow a Unicorn 3 1500kg now with a 17 plate previously a 13 plate

I would always go for a torque converter "slush box" auto ..... no clutch plates to slip (yes .... I know there are bands inside) 

https://youtu.be/4OSDw-uyP98

Another vote for the TC.

Others will probably do the job but the TC is head and shoulders above the rest.

I'm surprised you ask JV after all the other threads on the subject. 

Just need to find them 

 much a matter of preference.

CVT continuously variable transmission, no specific gear ratios as such actual type depends on manufacturer. Uses metallic bands and variable diameter pulleys to vary gear ratios. Some use a torque converter to start off eg Nissan X-tronic but note that The tow capacity of an Xtrail drops by 500Kg with the CVT auto.

Robot gearbox basically a manual system with actuators for clutch and gearchange as on some vans. 6 speed

 Dual clutch or DSG similar to robot but further developed, automated dual friction clutch, each clutch handles set gears eg Clutch1 = gears1,3,5,7 and 2 = 2,4,6 can have wet (Oil bath) or dry clutch. up to 7 speed.

Torque Converter, oil is used rather than friction material to transfer power from engine to gearbox on start, latest ones quickly lock in to gear in each ratio up to 9 speed (10 in US Ford)

My preference would be Torque converter, these used to have a MPG penalty but no longer, The advantage for towing is that engine torque is amplified up to 3x on pulling away. Tow capacity can go up with TCs eg Jeep Cherokee has a higher tow weight with auto than manual.

Then maybe a wet Dual clutch as these probably have a better wear characteristic for towing than the dry version.

https://youtu.be/4OSDw-uyP98

a live link for you ...... basically what viatorem said 

For towing, forget the rest there is only one worth considering and that's the Torque Converter.

Another vote for a torque converter for towing. 

K  

And another