Hoot proposed that he could swap his wheels for the ones on the Nomad if I really wanted CSS rims.
Should I buy the Nomad I would fit a rear disc brake before the brake track became too worn and have a front CSS rim on the front when the time came. I'd have rear CSS but SJSC only have a 36 hole rim as far as I can see.
Tayo, as a data point -- and only that because it is the result of personal preference -- when I got my 2012 Nomad Mk2, I chose conventional Andra 30 rims rather than the CSS ones because I was concerned the super-hard sidewall surfaces might become polished and in time contribute to poor wet weather breaking. That has proven to be the case for some long-term users who have partially or wholly addressed the problem by switching to different brake pads (i.e. Kool-Stop Salmon) as the rims became "slippy".
I had had a similar experience a couple decades earlier with a particularly hard-coated batch of (Trek) Matrix Titan 2 rims. They were great at first but then did their best to imitate chromed-steel rims and it was scary to sail through stop signs at the bottom of hills with the brake levers hard against the handlebars when it was wet. I was able to salvage them by actually milling off the rim sidewalls using a carbide burr. it was a long and arduous process and I ended up using the short words before I finished.
If your choice is between Andra 30s with or without CSS, I can reassure you I have found the plain rim to be very long-lived even when used in adverse conditions. I have them on my Nomad and my Enduro-Allroad bike and the very similar but slightly wider Andra 40 on my tandem. All have seen heavy use in grit and very poor conditions (i.e. wet desert playa which sticks like wet grinding compound) and they show very little wear even after a decade-plus of use. The Andra is a heavy rim in part because of its thick sidewalls which ensure a long lifespan compared to other plain-sided rims.
So, just something to consider as you ponder your options. In my case, if all other things were equal I'd choose the bike with plain, non-CSS rims.
All the best, Dan (...who is excited to think New Bike Day may be coming soon for you if all proves to meet needs)