I was in the same boat earlier this year;
I had a 2008 Chevy Express 3500 towing a 27ft - 5,500 lb trailer; It was
great - tons of torque and comfortable to drive.
I was thinking of buying another with the 6-speed transmission and really could not fault the Chevy. But I thought let me take a look at "new" technology even
though 1-2 year old Chevy was about $2000 cheaper than a Transit/Nissan.
I test drove a couple of Transit and was impressed, so I started looking
around for a 350XLT EcoBoost (passenger) - which I eventually bought.
So how do the 2 compare?
The Transit is 18 longer wheelbase and tows MUCH better than the Chevy; The
Ecoboost has tons of torque and comes on at lower revs and just seems to
pull. It's coupled to a great 6-speed transmission which is totally seamless
and has an easy to use rocker switch to hold/change gears;
The Transit is much quieter - very little engine noise intrusion and better
wind noise management. Ergonomics are better and feel more modern. The brakes
are also superior.
Fuel economy is MUCH better;
Unloaded - 14mpg -> 20mpg
Towing - 11mpg -> 14mpg
The downside:
- Max towing is limited to 7,000? lbs (but I don't think the Chevy can
"comfortably" tow much more );
- The driving position is "bus like" which takes getting used to.
Hope this helps.
Gerry