Considering a Car for Wife.

My wife’s Considering a Car to purchase for daily city traffic commute during peak hours (Drive around 35-45kms daily). Small, efficient and safe (preference) …. So far test drove the i10 nios, i20 and Altroz. Any suggestions on any of these would be good or should look for something else. Also let me know if petrol is Best or CNG would also be an option to consider (safety terms). Thank-You.