I've been experimenting for a while with Metamucil and Konsyl. I found that the Metamucil capsules didn't mix well enough with stool (at least not in my gut), and I avoid artificial sweeteners like poison. That left sugary Metamucil, in powder or biscuit form. I used that for years, but didn't really want to consume so much sugar. Konsyl is a more "concentrated" source of soluble fiber, but as several folks have pointed out here it's pretty close to sawdust.
For the past few months I've been mixing half Metamucil powder/half Konsyl. It's working quite well, and has reduced the negatives of either alone: half the sugar, half the sawdust. I've been pleased with the results and I'm going to keep mixing the two together. YMMV.