Lots of suggestions on previous thread here
Bel Air and anything from Charge do not meet the width test. Ergon SM3 has hard padding and a definite sweet spot, find it and it is very comfortable, lose it and it is excruciating. I found I averaged roughly 25% of any ride in the sweet spot so it followed the bel airs onto ebay. Spec Henge gets rave reviews but I think they were for the mark1, current one I found fairly short on padding and after an hour was like sitting on plywood.
Wide WTB Rocket V seems the best for me. Various options for price and padding as well as width. For armchair comfort on the 29+ rigid I have a Terry Figura Max Gel bought from Rose.
I looked at the Brooks Cambium but decided they might have the capacity to be seriously painful. Thanks for doing the experiment Ton.