I have done comparisons before and I can't see it making any difference. None. About it being more archival I don't know about that. Being able to wash it out is another matter. Surface hypo is washed out with turblance and the rest is soaked out over a period of time with paper. With film, 20 minutes should be enough time regardless which fix you end up using.
Stain increased in the wash regardless of the ph of the fix.
still not convinced