Altis would be a brand new car, thus no trips to the mechanic.....only general maintenance is required.....oil changes and the occasional gear box oil change after regular intervals
While Camry and Premio are used cars....you are not sure how they have been driven and maintained.....plus most of them would have their meters reversed....but then again, they are much more comfortable than Altis and would have less cabin noise.....also you would enjoy the drive more.....also regarding C class...you need to make sure the car has been maintained properly, otherwise it would just be a money pit....its not a Japanese car that you can get away with not following proper maintenance procedures
Rest it comes to you for final decision.....if you want to get a trouble free and brand new car that you will be able to dispose of easily....get an Altis.....if you want a car that would give you driving pleasure and also keep outside noise to a minimum, and if you are not too much concerned about how the car sells....get a Camry or premio or c class