I have the Kinetic. The only trainer I could try locally was the Cycle Ops (fluid or magnetic). A friend had the Kinetic and she let me try hers. I liked the way both felt, and, after reading many reviews and watching several you tube videos of trainers in action, I decided that the Kinetic (fluid) and Cycle Ops were roughly equivalent as far as quality and durability.
I decided on the Kinetic because of it's lower sales price (I love finding a good sale!) and the fact that its fluid capsule is sealed (they have a video you can watch on Amazon or on their webpage about this) so there is a very small chance of leaks.
I'm very happy with my Kinetic, but I don't think you can go wrong with either one.