We also use Textil PV. Used to use Ulano QTX. Cheaper, easier to get from our suppliers, and no discernible difference when we switched. Can't speak to whether it's "best," but it has worked well for us thus far. If we had a single point light source, I'd give some other emulsions a shot. But we started with a fluorescent unit, and now use a DIY LED unit, and it's fine for both.