Which Saddle?

Any feedback on these?

I find my SLR very comfy, but some numbness on longer rides... This looks much like an SLR with a cutout (?)... but that is one big ass cutout....

Would I be better off trying a MAX SLR ?

And anyone know the difference between the SLC and the SLK?

ta

have rode my slc for 7000 km now, no problem, nice flex cause of the cut out, will buy a second as the old one dies.