MWO = pay for EVERY SINGLE AMMO YOU SHOOT.
STO = free reloads of torpedoes.

MWO = Nvidia fairy or coconut bobblehead on your mech.
STO = so many costumes for your captain AND your entire crew.

MWO = No Bieber
STO = Bieber is here!

MWO = you can only fly your mech while you have jumpjets.
STO = you zoom through space at 14 times the speed of LIGHT!

MWO = new pvp maps
STO = so many maps randomly generated in exploration missions

MWO = you can't spam spacebar unless you keybind it
STO = SPACEBAR, MOAR SPACEBAR!

MWO = No OPVP chat
STO = OPVP chat AND zone chat

MWO = no heals
STO = Can i haz sci team? Yes, I can haz sci team