I have a 12 foot cataraft and will be upgrading to a 14 foot in two weeks I've drifted most of the west end river on the OP many times. I'd rather have a DB for fall, winter and spring steelhead/salmon fishing and the cataraft for late spring and summer trout drifting. I can drift the OP winters for summer trout/steelhead in very low waters. I used to think I could handle any water on the OP until a couple of weeks ago. I introduced myself to the bottom of the river via current and a rock. Other than hardware, the cataraft floated me down the river upside down until I could get out.
Bottom line is confidence. DB require more skill and catarafts/pontoons are more forgiving. (Except in my case a couple of weeks ago!).