A recent question/discussion on this site brought out the interesting fact that most probes around Mars are in Sun synchronous near polar orbit.
The ISRO web-site for the Mars Orbiter Mission writes to say
The inclination of orbit with respect to the equatorial plane of Mars is 150 degree, as intended. In this orbit, the spacecraft takes 72 hours 51 minutes 51 seconds to go round the Mars once.
Wikipedia on Orbital Inclination writes to say
an inclination greater than 90° and less than 180° is a retrograde orbit.
How does MOM benefit from this particular retrograde orbit?