The Answer is : It Depends
It depends on what you want from the tour.
Delhi is a Sightseeing City with lots of of must visit historical places, museums and shopping markets.
Just to name a few : Red Fort, India Gate, Raj Ghat, Rashtrapati Bhawan, Qutab Minar, Indira Gandhi Museum, Jama Masjid..and lots more.
We have prepared a Comparison Chart between Delhi Darshan by Car & HOHO Bus.
This will help you realize which transport option best meets your requirement.