Your requirement is like that of most commuters. The newly launched Platina is an interesting vehicle and I see more and more playing the roads where's earlier it was the Hero Splendor. While it would be safe to peg a trouble free experience of 4 to 5 years, it would be funny to want to use it for 25 years. While in theory it is possible, what kind of service backup you will enjoy is the big question.
The new kid on the block is TVS Radeon. It promises to be better than most. Question is will you get the spares and service which you need, in your vicinity to make it last and last. Looks wise it is a winner.