Ignore anyone who says a specific model that’s like saying “levis 501 32W 32L” to someone you don’t know what trousers they wear. It’s worth being a little scientific then picking one that fits, there isn’t much to them really!
Corrugated cardboard sit bones test, plus about 20mm.
Cut out – how flexible are your hip flexors, the reality of modern life is you probably need one unless you spend more time walking than sat down, short your hip flexors pull your pelvis forward, pushing your notcher into the saddle.
Flat Vs hammock shaped – personal preference, roadies tend to prefer a hammock to spread pressure front/back, MTBers a flat saddle to move around on. Selle Italia SLR Vs Flite is the obvious example.
For me ~135mm wide, mid sized cut out, flat top fit’s like a glove, spoon isn’t cut out enough and is way too hammock shaped.