Depends on where I'm fishing. If I'm on my home water, or a few mountain streams around YNP that come to mind, I'm probably going to find smaller (although not always) less selective trout; in that case, I like to use a high floating general attractor like a foam-backed Convertible that is good for more than one fish before I have to swap it out. If I'm fishing a tailwater or any other stream with larger (although not always) more selective trout, I'm willing to use a more realistic fly that may only float long enough for that one nice fish.

Regards,
Scott