I'm hoping to be in.
I have ridden the D&SNG, and the Cumbres and Toltec (Chama-Antonito).
I think the scenery is more spectacular on the C&TS--ESPECIALLY that time of year. In fact, we usually ride it right around that time of year, and this year it may be October 4 anyway.
C&TS also isn't as "touristy" as the D&SNG, meaning you can wander around the yards and look at awesomely cool machinery.