Leafly is the app I was talking about. I heard last night there are now over 200 weed stores in Portland (and it's not a big city). Anyway I think the different strains hit people differently but for me smoking strains that are heavier on the sativa end instead of indicas generally equates to giving up some of the euphoria for a slight case of anxiety. I think people buy them because they are known as the type that kind of speeds you up and indicas are known as the type that slows you down so they think it's better because it doesn't make you as tired or whatever. The whole speed up or slow down thing is really a myth that black and whites a more complex reality.
If I want something to speed me up I'll stick with coffee.