Karnali hands down. It's a true wilderness experience. The sun kosi sucks, it's very overrated. I did the lower tamur and it was pretty good but the karnali is where it's at. You should check out bardia national park near the take out, it's a quality experience seeing wild tiger and rhinos.
I didn't do any commercial trips but paddle Nepal seemed to have it together. With most things you get what you pay for
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