Yes thick leather saddles are heavy , so you just look at plastic base and padded , with a thin Pleather cover ..
Really its between your arse and the saddle , not a popularity question ..
80 out of 100 miles you have been sitting down too long. nothing will be comfortable forever in a day.
I will have made a Pub stop and had lunch in that time ..
The list: SI Turbo(80s) SM Rolls , SM Concor Max (not reintroduced since then)
and the Brooks Professional .. to cut weight they now sell a Titanium frame model .
around town Fizik Vitesse , CP3 another discontinued one. the HP is thinner padded , the base edge can be felt..