commute between noida and greater noida

i'm moving to greater noida near ek murti (<2km) soon and my office is in noida sector 125. i work from office twice a week. timing is flexible. what would be the best means of transport? [in terms of money, time and efforts? shared auto/metro/car pooling/shuttle/any other option/route? considering booking a cab/auto is too expensive and time taking during rush hours.]