One thing I still dont get why do some people pick the oppies...

One thing I still dont get why do some people pick the oppies over the heads especially when some of the times the heads are better value/cheaper to buy at times...I do know if the company increases in value the oppies become a great deal but why not buy the heads which are the same value at times or even better value then the options....i dont know if i have it right, Im thinking its because,

there are less options on issue then heads? so easier to sell if needed? not as much supply? I know thats what @john435 had done bought heaps of options with CLY maybe john can answer? thanks