I have some circle streamer hooks and found them particulary effective for the purpose that I purchased them. I fish for carp and just hated foul hooking fish that were stacked up like cord wood. The fish were so thick that I found myself snagging a fin or other body part. I took no pleasure in catching fish this way so I bought a couple of sizes of circle hooks just for these fish. I was able to cast a bugger type pattern into the mass of fish work it slowly and when I saw a fish pick up the fly hook set on sight. They worked out nicely for that application. I might have missed a couple of fish because of the circle style, but the trade off for not snagging a bunch of fish was worth it to me.

Will be watching other's answers with interest.