I know of two very comfortable fundament supports for those who prefer a back angle of only ten or fifteen degrees from vertical, and those who are heavy -- I used to be a 190lb athlete but these days I'm 15 pounds heavier.
The first isn't a saddle but a seat. The Cheeko 90 is a little bucket seat with low sides on three edges. It's padded and mine was covered in a reasonable facsimile of the MBTex found on the seats of the more expensive Mercedes in the '60s and 70s, only not so hard wearing. These photos, found on the net by Dan, aren't of mine, which doesn't have the built-in lamp either. Those rails have less adjustment than at first appears, because this is a seat you lean against rather than sit down on, so it works best if the mounting point is right at the front so the front edge is in line with the seat post. Out of production, of course, but very occasionally new old stock becomes available.
I've sat on a few Brooks B17s of various versions, though I've never owned one. Just a short ride on a B17 every few years is enough to convince me anew that it is an instrument of torture from the age when cyclists were hard men with harder bums.
But, because Thorn had it on sale for fifty quid, I bought a B73 as an experiment, fully expecting to hate it. On the contrary, it turned out to be very comfortable, and 11,000km later anyone who wants it will have to unclench it from my cold, dead cheeks. It's a saddle on which to sit upright or nearly upright. I can't imagine it has any drop bar applications. But after two pandemic years nearly permanently off the bike, I immediately found it comfortable for a standard ride. As far as I know, it was the third widest Brooks saddle, but the B135 was never common, and the B190, the largest of the Brooks saddles, is for German baumeisters. The B73 has helical springs at all three corners and the twin mounting rails are also springs. It looks like it could be unstable, but anyone who tells you that it actually is unstable has never ridden on one. The springs are stiff enough to be flexible in only one direction. The leather is a hammock, of course, or to my eyes (as a racing driver, my field of car development was tyres and chasses) another spring. By some magic these springs all work together in perfect harmony.
Before you rush out to buy a B73, first find and acquire your twin-rail adaptor, which allows you to fit the B73 to a micro adjustable seat post, rather than Brooks' crude fitting which also requires a dedicated "candlehead" seat post (parts which have no place in this century). SJS sells spares and accessories for the B73 on this page:
https://www.sjscycles.co.uk/search/?term=Brooks%20B73&geoc=IE
