I can not comment on the Nano Tour or Dream on, as I have no experience with them. The Guru is a very good ball and will do what you're looking for. The core is so versatile, you can really get the shape and ball motion you're looking for with it. I know you didn't mention it, but the new DV8 Thug Unruly is a fantastic ball. It'll handle oil and has a lot of backend reaction. It would allow you to use it with ease. I know the Nano Tour is symmetrical and the Guru is asymmetrical . . . the Guru will be stronger than the Nano Tour.