Binary decisions are poor.  Diversify.

60% BTSX, 30% NXT and 10% Peercoin and you're probably guaranteed to either be filthy rich or break even.

BTSX has largest chance of success by far.  NXT is doing a lot of things.  It seems NXT's limited distribution may not hurt them that much and it helps them finance projects.  Peercoin has a chance of sticking around with their self-funding too, so I wouldn't count them out completely.  BTSX has the most going.  NXT seems to have started to follow their lead with NXT's recent announcement of direction.  (The corporation metaphor)