I like Hatate because of the "same character done different" appeal. This is why I like the fan characters Achicirno and Meimu, and it plays a part in my love of Sanae, too. But usually, it depends on the base character. I like Aya, but not that much, so that goes for Hatate too. For fan-stuff, I don't really care about Nitori so I don't care about Mitori either. The Reimu-Sanae difference is almost the same, I like Reimu's design, so I like Sanae's more, but here, their personalities play a much more important part in my decision and love, this is why I love Sanae a LOT more than Reimu.