Kubota is probably the best price-to-value ratio in the small tractor market. Parts are much easier to get than some of these Chinese/Indian brands, and you will need to fix it, that's the nature of a tractor.

Mahindra and Kioti have both service manuals and parts available. I've seen some people online complain about issues with specific dealers and having to wait for some parts to be shipped from overseas but that isn't specific to those brands. I've never owned either one so YMMV.