I think most people want the Mini because it's size, it's smaller and more convenient.
Previously I thought I don't get anything out of vibrating toys, but I've had tons of fun with my fling's Fairy Wand, which he uses for forced orgasms, three in a row. Now I've been considering buying either Fairy wand or the mini version. I haven't yet found a good comparison on the intensity. So just to be on the safe side, I think I'll take the classic larger model.