I had a 700c wheelset custom built for me by Colorado Cyclist. I choose the DT470 rim because it has a 20mm inner width which I think is versatile to run 30-45mm tires. CX wheelsets may be on the narrower side as they're primary designed to run 33mm tires AFAIK. WTB has a chart that represents what combinations of tires/rim width they recommend:
https://www.wtb.com/pages/tire-rim-fit-chart#
Beyond width CX wheelsets may have fewer spokes in order to maximize performance/weight rather than durability. There are many opinions on this but i think most all agree that you'll be unlikely to have issues with a well built 28 or 32 spoke wheelset.