^I don't really consume drugs recreationally. Anything that effects sobriety just seems to effect it in a way I dislike. It was mostly research for a few less intelligent friends and then I got a reputation of knowing all about them so found out a lot and found it interesting. I've tried a couple from each category once or twice though mainly just to know what they felt like, I don't really know if I have a favourite though.
edit: actually I guess Kanna would be my favourite as it effects were so mild with just a touch of calm and pleasure.