That's a great question to pose, and I look forward to seeing what people come back with.

Just checking out my Steem-Engine wallet and I have received through various means, a whole bunch of tokens I don't know much (or in some cases anything) about. I figure if it's stakeable I'll stake it for now and see what grows and what doesn't. If I having tokens staked proves beneficial I'll keep up with it. If not, then I'll probably unstake and ditch them.

At the moment I have staked in varying quantities...

PAL
FUTURE
LEO
STEM
SPORTS
JAHM
INT
GG
GEEK
STEEMSPEAK

So I guess any of those is as good a place as any to start :)