Well, I was also a bit concerned what settings to use for the best results and made some comparisons ... But to be sincere, I found that to my ears the audible difference between these settings is so infinitely small, that it probably does not matter at all ... It was also difficult to tell a sound difference between standard dither and direct conversion from 24 to 16 bit directly via r8Brain ...
So just for fun I keep the minimal phase (because somewhere it was written it sounds more analogue
) and ultra steep mode ...
What I quite miss there is the estimated time of finishing the operation (when you have lot of files to process...)