I really wouldn't have much use for any of the other powers, so I'd take the ability to super-chill whenever I wanted without having to ingest any potentially damaging substances.
The yellow pill looks tempting, but I'm not sure I want to know exactly what people are thinking. It would come in handy on dates/talking to girls, but it would also take the fun out of it.
The only one I really like is the shape-shift one. Changing into anyone or anything would be cool. Hopefully I could resist the temptation to abuse that power.
Can we dump them all out and snort them? lol Thatd probably cause your head to explode and shapeshift into a flying thought reading clairvoyant penguin with telekenesis and a bad haircut.
I dont know i guess the yellow or the pink pill sounds like you could have a lot of fun with.