Again confusion over choosing petrol vs Diesel

@SVP Hi, I have decided to purchase the baleno car (top model) to be used for a really long time, say next 7-10 years.
My average usage will be around 1200 Km per month. Now I am confused to choose the engine option.
Now which engine will give less trouble after 5 years of usage, low maintanance cost, resale value to be considered.
Whether petrol engine milage will become worse after long period (a technocrat told me it’s a heat engine and don’t last long :fearful:)
I am looking for value for money than performance.

Very eager to see you at Auto expo 16 (of course via TV :sunglasses:) and wish you a happy new year.