Samsung galaxy on8 has powerful battey backup and full hd super amoled display. They all are similar / same( 5.5 inch, Octa Core, Min 2 GB / 16 GB Combo, 13 mega pixel camera), but Samsung made sure that there are differences by altering certain components on each devices. Had Samsung made one device with best components from each of the above, it would have been a perfect mid ranger which can be sold in$ 250 -$ 300 range.