I've put some time on the diesel Mule and the Kubota. I like the Mule better, and if we get a second one, it will be a another diesel Mule.
Yes, both have glow plugs, and i lived in Alaska 25 years, when it gets cold NOTHING starts "every day" day after day at -25... peroid! You put a block heater on, and then they all will start. OR come up with some other way to get heat to it.
Top speed is 25 mph on either one, and they weren't made for speed, they were made for work and they have excelent torque for that.
Anyway, the diesel mule we have, has been excelent...
BTW, IMO the john deere's don't even come close to the mule or kubota as a work vechile unless you live where there's no mud!
DM