I've seen the side profile you're calling "hammock" referred to as "wave". It's the best shape for riders like me who are fairly inflexible and roll our pelvises forward more than bending at the waist. I find flat saddles to be uncomfortable. I tried a Rolls, because one of my bikes came with one, but it is too flat. If you roll your pelvis, then a wave or hammock saddle might work best.

The next question is how flat is it across the back? If the saddle has no relief channel or cutout, then being curved across the back will raise the center ridge of the saddle relative to where the sit bones rest, and put pressure on the perineum. This is why I prefer a saddle that's flat across the back, more like the Concor, versus curved like the Rolls, even though the Concor is nominally not as wide.

Then there's the profile viewed from above. My preference is for a saddle that stays narrow farther back. If a saddle flares too close to the front I end up trying to find the compromise between thigh rub and sit bone support.

I did find the perfect saddle for me, but they stopped making them in about 2000, so I'm left finding used ones on Ebay. Fizik Aliante variants can work, but not quite as well.