I've ridden both. TOD is something I guess everyone should do at least once. In my opinion, it's fun, something to check off of your to-do list. Having the photographers on the road is nice. But there are a lot of idiots riding beyond their ability, and others who pose for the pics (dangerous). It's congested at times. I have ridden TOD multiple times, will ride it again because of it's location and proximity to so much good riding (I'll be up there again in June). On the other hand, I agree there are other roads that are nicer, longer, and less congested, like Moonshiner's 28, the Skyway... I can't even remember them all.
I rode The Devil's Highway last May as part of an epic-for-me trip out west (Orlando to Cali / Vegas / Grand Canyon north and south / Zion / Bryce / Million Dollar Hwy...), and it was definitely a highlight. My thoughts on The Devil's Highway: Scenic. No traffic for us. Not commercialized. Nice elevation changes. Maybe it surprised me because I expected it to be more challenging (I was pretty intimated the first time I rode the Dragon). I found it really pleasant.
If distance wasn't an issue, I'd ride The Devil's Highway again, and spend more time out west. The Dragon is closer for me, so I'll end up in east TN and western NC a lot more.
Didn't notice where you are from before I started responding. If you want to muddy the waters even more, take a look at The Snake. I think it's US 421. I found parts of that one more challenging than The Dragon. It's longer, less commercialized, and can be added in to a trip that includes the other roads I mentioned.
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