Diesel vs petrol(afterwards cng)

Hi,
I want to buy an elite i20. I daily commute upto 130 kms indelhi. My only confusion is, what should i prefer the diesel variant or petrol(afterwards cng). I am currently using cng i20 car with which i daily need to fill my cylinder.
I would appreciate if other options will be classified by you😊.
Thankyou and Regards
Dishu Malik