Look wise Bolero is much better but space inside sumo is beyond comparison.
Seat 4 people in mid row in both the vehicles, drive for an hour and take the feedback from people (do it with same set of people to make it control group). Bolero is cramped inside and can only seat 3 comfortably (taxi guys seat 4 in middle and total 10 people generally, once I saw 26 people inside Sumo, god know how did 26 fit in in Uttarakhand)
Seat 4 people in mid row in both the vehicles, drive for an hour and take the feedback from people (do it with same set of people to make it control group). Bolero is cramped inside and can only seat 3 comfortably (taxi guys seat 4 in middle and total 10 people generally, once I saw 26 people inside Sumo, god know how did 26 fit in in Uttarakhand)