My personal favourite is Chinto.
It tends to change but Niseishi and Wanshu are high on the list. The kata I least like at present is Kururunfa, as I'm trying to learn it and failing miserably...
I've always liked the 'feel' of tensho. To non-karateka I think it looks quite impressive too! Wanshu is also pretty high on my list (to watch)!!
Ah, but which version of Tensho? Sensei Snewin recently put the cat amongst the pigeons!!