The best one is the one that works for you. That means try them out and see. Personally the Halo never worked for me and I had free access with a Sharon Schamber class. Honestly, I hated it.
So far the fabulous Fabric guide works best for me. I don't have to put any pressure on it and it is easy to hold in a non-traditional way. It is great for those of us with arthritis in our hands.