I own one of each. The 2011 Mahindra 3616 (36 engine hp, open station, shuttle shift) was made by Misubishi I believe. Certainly the engine was. After almost 9 years and 900 hours, I have had two out-of-the-ordinary repairs: the right front axle seal started leaking and I don't remember any trauma to that area and the glow plug controller issue that has been discussed here. Fixed both problems myself and do all maintenance myself. My only real complaint is the use of plastic parts for the grill area, around gear selector / fenders and the multi-piece hood with side panels. So the general verdict is mechanically sound, but fit / finish is a little poor.
The 2019 NX5010C (50 engine hp, cab, shuttle shift) only has 25 hours on it, so no comments on long-term quality. I did look at a new Mahindra (and Deere, Kubota, Massey) and chose Kioti. The fit / finish, ergonomics, features, option pricing, weight and lift capacities of Kioti far exceeded the others. Only time will tell if I made the right choice.