Its more difficult to complete missions in free aim and its always empty so i cant get help either. i never played auto aim in the game and wont but i realize it dont get me anywhere
everyone is having fun on auto aim, making fast money and im all by myself doing jobs for gerald.
While you have a point about missions in free aim being a bit more difficult, it doesn't really hold water as a justification for getting higher payouts/RP. Why? Because even in auto-aim sessions, there is free aiming involved when shooting from a vehicle, sniper rifle, heli (except for that damn auto-lock, which is present in all aim modes), and so on. IMO, free aim is just a way to make free roam and deathmatches a bit more entertaining, and maybe adds a slight, but self-imposed challenge.
tl;dr - Use free aim for PvP/co-op, do missions in auto-aim sessions.