On my third Brooks just now.
The advantage and disadvantage of ye olde english leather saddle is that the leather moulds from factory shape to your arse shape. Nothing else comes close for comfort once it has broken in but it will require a little care if it is not to pass through the ‘perfect’ stage and become too soft and saggy. Water absorption or overwaxing can ruin them. I use nikwax on the underside to protect and soften when new and occasional shoe polish on top to provide a waterproof skin without further softening.
Biggest problem for me is the cost outlay and simply not knowing which one to choose. The frames are all subtly different between model numbers. It isn’t as simple as sit bone width as the reach and height difference between saddle and bars will alter the angle of the rider’s back, rotate the pelvis and change which part of the sit bones is being sat upon. Brooks, CTC and other web sources can give general advice regarding wide saddles for sit up and beg / narrow saddles for lower bars but specific advice from others on exact models is of limited use as your arse is unique.
FWIW, I’m quite slim with a narrow pelvis, here’s my experience;
1st was an old B17 on a road bike, dead comfy for years until the sides splayed too much and rubbed my thighs. Should have punched and laced it but sold it with the bike.
2nd was a 1980s B66 (a B17 with soft springs) used on a rigid MTB. Best saddle ever but the lovely give of the rear springs was offset by a rock solid bollock bursting nose. Off road riding ‘on the rivet’ was a big no no. Still regret selling it with the bike.
3rd is a Conquest (Team pro on firm springs) currently adorning a commuter. Took ages to break in but now a good shape for me but the springs are too firm and only give on very rough surfaces. To be fair it is an MTB saddle. Still dead comfy though.
Also using a Wrights Model 40 (B17 copy) on a borrowed bike. Comfy and supportive but already shaped to the owner’s bahookie, so slightly ‘off’.
Next one will be a Team Pro or B17 narrow for the Audax bike.
Your best bet is to borrow one or more and feel what general shape of frame is closest to your shape and posture. The leather and yer bum will do the rest.