Well the level of easy medium and hard refer's to the hostile npc's
Easy (-1 level of what you are )
Medium ( same level )
Hard ( +1 level of what you are )
so if you are level 10 and you solo a mission, on easy mode you'll fight level 9 npc, and medium you'll fight level 10 npc, and on hard mode you'll fight level 11 npc
Usally on hard mode you'll always get more exp and $ [ it also depends on how many pharse you get during the mission]
hope this helps~
Easy (-1 level of what you are )
Medium ( same level )
Hard ( +1 level of what you are )
so if you are level 10 and you solo a mission, on easy mode you'll fight level 9 npc, and medium you'll fight level 10 npc, and on hard mode you'll fight level 11 npc
Usally on hard mode you'll always get more exp and $ [ it also depends on how many pharse you get during the mission]
hope this helps~