So you mean that in case i know nifty will go up by definitely 20 points it is more profitable to buy the call rather than futures especially after margin (or the lack of it in options) and brokerage (less comparatively for options compared to futures) is considered.
The only plus point in options which I have felt is they are cheaper. My brokerage firm charges 27-28K for nifty. Though for call/put options, you do not have to put that much money at stake (only if you are buying them), you can buy them at the trading price.