I use ascorbic acid developer with 35mm, but not DS-10.
My dev is based in Patrick Gainer's propylene glycol 'alchemy', and promises to last a lot.
Ascorbic devs give finer grain and are sharper than HC-110, my only commercial dev in stock, so I cannot compare to others.
In a 24x30 cm print, I have to use a loupe to see grain with PX (or, maybe, I need new glasses...)
All I've read about Xtol was very positive, except for the sudden death syndrome.