I’ve been through a few recently!
Fizik Antares Open (more just a hole than a channel), Selle Italia Flite Boost Superflow (channel), Specialized Power Arc, and now trying a Fizik Terra Argo on the gravel bike (huge cut-out and a rubber spray guard underneath).
The Terra Argo is working well so far, first saddle I could genuinely relax into for a long day out without any discomfort.
I did some big days on the Power Arc and it was ‘OK’ but I think the general shape was too curved for me, the kicked up tail was forcing my weight forward on to the nose. No doubt I could have persevered with adjustments.
I have a new Fizik Vento Argo on the winter road bike, am hoping it’s similar to the Terra Argo i.e. suitable for plonking down on for long miles.
All that being said, I’ve been gradually lowering saddle more than I thought sensible but it has improved comfort no end, I’m down to 750mm from BB centre from 780mm! I think that should always be your first check?