^I think the more neutral, the better. Since higher speed discs tend to not be truly neutral (like putters or a mid like a Comet), and they will always want to fade when they slow down (which can help the disc pan/glide longer), then I do like it to have a touch of turn so that it holds the anny for longer.
For high speed drivers, I actually throw my "middle stability" distance driver for the shot...my Vulcan will turn way too much to not start it on a hyzer, and my more turny Destroyer is too finicky. With high speed discs I feel like it's almost easier to really power the disc over the apex on an angle, and let it pan out of the shot over time. If you're trying to give it "some angle", knowing it will add to it, but not wanting to crank it too hard and turn it into a roller...then it becomes way too finicky of a shot (a little too much might cut roll, but babying it will make it flex out real fast). That being said I think that a slightly less stable disc may go the farthest, but at that point it's a full distance line rather than pretty reproducible golf shot to me. If I need the disc to 100% go right and have some distance, then I'd rather throw a FH, but the higher anny shot with a stable disc can definitely go farther and end up farther right...just it might not if you mess up.