Disclaimer: I am not recommending this as a 40-miler; I'm sure I've never ridden my electric that distance, and I doubt that I would do that to any part of my body. As Mr. Coffee notes, it's a complex question, and he makes good points. I've also learned like others, over the decades, that less is more, but I'm not fanatically minimalist about it either.
Still, so: I like Serfas saddles. Good quality at reasonable prices. I've had a Serfas Performance RX saddle on my Neo Xtrem for most of the six years I've owned it. I don't think of it much on rides, which is good, and my neck starts bothering me before my butt or crotch does. I also had a Performance RX on a Trek DS for 2 or 3 years, but I replaced that one with a ("less-is-more") Serfas Men's Road one. I'm 71, 6'1"/1.85m and ~185-190 lbs/85-86k. I've never liked the RX lettering, but do endorse the RX otherwise. It's not too soft nor wide ("less"), especially important at the nose for me, but it does give me the additional cushion and the support I need on the 50-pounder. Enjoy that Allegheny trail!