Pretty much any waterstone will beat a resin-bonded diamond stone for feedback, as far as I can tell. My best feedback synthetic stones are the Gesshin soakers, by far. But it's not that important to me. I need some feedback, yes. People complain about the feedback of the SG stones, but I think it's great; it's just subtle. You have to learn to listen for it. For feel, well, I like hard stones, so the SGs are about perfect for me. In a way, they are like the harder JNats. They seem hard and unforgiving at first, but when they get into the zone, they tell you, big time. OK, for JNats, you need slurry to make that happen, but it's still kind of similar.
As for other waterstones, let's see. I had a full set of Nanohones, but sold it recently. Not because they were not good -- they were. I just didn't have a place for them any more, I never reached for them. I am currently playing with some superdense stones, Naniwa Hibiki and Suehiro Gokumyo 2K, but I would not say I've reached a final verdict. I got a Shapton Pro 1500, and it's very good, but I expect to give it to a nephew who is thinking of becoming a chef. I was curious about it, but with an SG 1000 and 2000 around, I just don't need it.
For carbon steel, if you are using 4K or above grits, I'd definitely recommend checking out the SG HC series. They're just wonderful on carbon steel, and creamier-feeling than the HR series.
