Robert,

I don't use such flies for bass, but I will hazard an opinion.

Likely the 'Trude' style moves more water and makes a larger 'commotion' when worked.

The EHC really is designed to 'skate' or 'skim' the water. The evenly distributed hackle will support the body mostly off the water, and cause it to lift up rather than dig in when you twitch or pull on it.

From what I can tell of the Trude style, the flat face of the hackle on the front will act more like an inefficient 'popper' when you twitch/pull it.

Just an opinion based on how they look, I've never seen a Trude Caddis up close, and I save the EHCs I tie for trout.

Good Luck!

Buddy

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[This message has been edited by Buddy Sanders (edited 06 February 2005).]