Knee-jerk political fealty virtue and vice signaling aside;
The reason I got a Transit was that it was cheaper to own and operate at the time.
Sprinter was niche and more expensive, with a lot of whining on the Sprinter forum about LHM and disabling due to faulty DEF system sensors (10 notifications and then it wouldn't even start; some owners on trips would just leave it idling on short stops to preserve the # of restarts they had remaining until getting to a disservice center). Also, diesel cost more than Supreme at the time, and the mpg was only marginally better than a gas Transit, negating any fuel cost savings.
RamMaster was cheaply made, even more so than the Transit, and also had more owner-reported issues needing warranty repair. Also, by the time I got my van, the RamServant had climbed to the same price as a Transit. In the prior year, they were about 20% cheaper than Transits (back when dealerships sold below MSRP and offered manufacturer discounts). For the same price, it's Transit all the way. At 20% less, it's worth looking at.
It was 70% cost of ownership and 30% reliability for me. About 8 years later the landscape has not changed. There are still just 3 eurostyle vans available, from the same companies. MB has fixed the "inactivate van" issue, but still only offer expensive diesel drivetrain. Stellantis has not improved nor reduced the cost of the ProRamMaster. Transit has had some minor changes and has a new pair of engines; that aren't significantly more efficient than the previous ones, if at all.
GM, Hyundai, Toyota, etc. have yet to release a full size, stand up height (eurostyle) van in 'Merkuh/Canada. The Nissan thing isn't really a "van", and it gets horrible mpg.
So, Transit is the best of what's available at the moment as far as I'm concerned.