That engine is very likely a Kujke built "Cummins" ... just like my LS has an LS built "Mitsubishi" --- basically the companies buy the license to build the engine. I can't say if my version of the Mitsu is any better or worse than if it had been built directly by Mitsu in their own factory, so I would assume the same logic would apply to Branson's engine.
I think the Branson's look like decent machines. There's no dealer near me so I had to shop them ONLY via the internet and I didn't know enough about them to keep them high on my list. I've read about some problems with them from this forum, but that's all I know.
Keep in mind, that "lift" number you are using for the Mahindra (lifts over 3000 lbs) does NOT apply to the loader, it applies to the 3-point linkage (actual number is 3090 lbs at ball ends). The 4035 loader lifts 2400 lbs at max height (measured at the pins) with 3900 lbs breakout force at ground level (at the pins). If you shop Mahindra, some of their tractors are made by Mahindra, some are made by TYM, some engines are Daedong (parent company of Kioti), etc etc etc... but they seem to be pretty good tractors, and if I had the money, I'd be inclined to seriously consider a 5035, 5010/6010 cab version.
Lots of good tractor companies out there right now. I would say don't bother looking at Case or New Holland, because LS makes them. You can literally buy the exact same tractor directly from LS for thousands cheaper. Kioti is a good tractor. (McCormick is a red Kioti) TYM's are pretty good, but seem to have some problems (see the TYM forum). Kubota makes good tractors. JD makes good tractors. But JD & Kubota seem to be #1 & #2 in the pricing lines across the board (from what I've seen).
HST vs Shuttle: If your PRIMARY task is ground-engaging work like plowing, grading, etc ... then get the shuttle. If the majority of your work is going to be EVERYTHING BUT those things, then get the HST. It's better for loader work, mowing, and most every other task where you go any direction but straight. HST rocks. Kubota has an HST system on their "Grand L" line called HST+ and it has some advanced features that make the HST even better, but you'll pay a premium for it.
Good luck. And, if you like the Branson, buy it. No one will fault you for it. Just do yourself a favor and test drive everything you can (within an hour or even 2 if needed) because you will definitely find pros & cons to all of them.