Does anyone have enough experience with both the Titanico X and Titanico NSX to compare the feel and ride characteristics?

I'm trying to decide on a saddle for the Surly Troll that I'm building up. I'm seriously considering the Selle An-Atomica Titanico X (with slot) and the Titanico NSX (without slot). I'm 6'4 and about 220 lbs. The Troll is going to be a do anything bike -- sometimes commuter, some single track, some short touring, some bike packing, some hauling, etc. I tend to prefer a more upright riding position and will most likely be going with a Jones Loop H bar or comparable alt bar.