[srs5694]

I don't think a sitting desk would be a good choice unless you elevate it or happen to be short in physical stature.

This assumes you work in the darkroom standing up. If you prefer to work sitting, then desk height is likely to be very good. Personally, I prefer to sit; standing through an entire darkroom session (2-4 hours for me, typically) gets to be uncomfortable. I've got a cheap rolling chair so I can move easily from dry to wet side without standing up.