Main difference for the 1.3 MJD would be reduced turbo lag and improved low-end. Claimed figures are up to 25 bhp and 50 Nm bump. For stage I, only disadvantage heard so far is warranty issues if found by the dealer.
The car is being driven less due to the 2nd wave of the Pandemic. I have stopped going out unnecessarily. It now just sees weekly grocery runs. Been travelling in my bike for work. Hope things start to recover this month.
Oh! Its my bad. Forgive me for confusing it with diesel tiago with revotorq engine (which has been discontinued post BS6).
So maybe it's just the tyres,which you can compare by driving any other car with factory specs.