Comparadun and Sparkle Dun are both good flies for flat or limited turbulence water. I have developed a preference for the Sparkle Dun over the years. I view the Sparkle Dun as an emerger pattern that can be floated at different depths in the film by where you place the floatant:
- Lightly in the film--grease the entire fly.

- Well into the film with fly rear tilted down and deeper--grease the wing, thorax and head.

- Deep into the film--grease only the wing.

I have been amazed how fish will sometimes have a differniated view of these greasing variations.