Paul - you won't find much in antinewton glass these days except from Focal Point. It's decent stuff, but maybe not equal to true Durst or Omega glass, if you can still find it, which have more of a wave rather than stippled pattern. Which kind of glass is best depends on the film,
the focal-length/angle and MTF of the enlarging lenses, f/stop and degree of magnification, the diffusion of the light source, etc,etc. I once had samples on hand of well over a dozen brands of antinewton glass from all over the world. Now all but one are out of production. Sometimes optically coated picture glass will do, but not in my climate.