In your opinion, which is the best way for space travel? Is it travelling using gravitational fields like India’s Mars

Question: In your opinion, which is the best way for space travel? Is it travelling using gravitational fields like India's Mars mission or using fuel for the whole journey?
- Keywords:
  fuel,
  Mars,
  space,
  travel
Asked by Navaneeth to Agata on 21 Jun 2016.
- Agata Suwala answered on 21 Jun 2016:
  
  I guess it would be a combination of both, I’m sure each method has it’s advantages and disadvantages so merging them together should produce a good method of travel.

Question: In your opinion, which is the best way for space travel? Is it travelling using gravitational fields like India's Mars mission or using fuel for the whole journey?