Me and a bunch of club buddies, cyldesdales included, got in on their annual Christmas sale one year and bought what is now known as their X and T series.

A heavier rider will cause premature stretching of the saddle leather. The anatomic cut out further exacerbates that problem by removing a lot of material from the structure of the saddle. You're trading long term durability for comfort.

It's a process that culminates in the rider's weight causing the leather to sag when being ridden on. Necessitating the use of the tensioning bolt at the nose to further stretch the leather over the saddle rails. However, the provided bolt will eventually reach its maximum length, where further tensioning of the stretched leather is no longer possible.

You should get the one without the cutout.

Even if you end up getting the X series with the cutout, you might experience "pinching" of your perineum mid-ride, by both sides of the cutout flexing down-/in- ward into a pinch point as the leather warms up to your body heat and becomes more pliable.