I don't think you'll ever be satisfied so long as you split hairs over which fresnel is "best." The really right answer is to avoid using a fresnel and learn how to use a simple, old-fashioned ground glass with a good technique and darkcloth. Look at the fresnel as a nice luxury, not as an essential, and don't worry about it so much - use one when it works, but accept that with with some wide angle lenses it isn't going to work as well, or you're going to get lines, or you'll have to grid the ground glass itself (with a pencil!)