You don't mention in which direction you are riding, which in my opinion does make a difference.
If you are riding East to West, then my advice would be to definitely ride the ACA route. If you are riding West to East on the ACA route, then you should be aware that all your climbing will be towards the end of the day. However, I would still recommend riding the ACA route. It is beautiful country and the remoteness added to its attractiveness for me.
I rode from Fort Davis to Van Horn and it was 91 miles. The climbing was early in the day out of Fort Davis, up past the Mt Locke observatory. There were no services the entire day, apart from the service station approx. 20 miles out of Van Horn, which is a large service stop. There is nothing at Kent in the way of services.
However, you shouldn't be daunted by any of this. I carried extra water and managed quite ok, although it was a long day in the saddle.
Enjoy your ride.