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)