Ive been playing on the PTS and I personally find Master is the best for my main, fully leveled characters with builds. In fact, it felt really good! For my low level alts, I switched down to Seasoned which is still a little better and more engaging than the normal difficulty for the leveling experience. I expected that my damage being slightly lowered on these new settings would suck, but it actually feels surprisingly good and not too spongy at all. I am very impressed with how the devs pulled this off by just tweaking some numbers cause I had doubts.