Is Dragonite's Dragon Tail/Hurricane #1?

Keep it. DT/H is awesome against Machamp bosses especially if Machamp's charge move is Heavy Slam which you don't want to use Psychic mons. DT/O is not the best counter to any bosses.

Dragon Tail/Outrage is by far the best move set for Dragonite. It has the best DPS for Attack and Defense. Rerolling your move into an outrage would definitely improve your Dragonite but beware because using a TM to change it doesn't guarantee you'll get it (basically you might get Hyper Beam again it's only a certainty that you won't get Hurricane).

My one and only dragonite has DT/H, and I'm happy enough with that moveset. So I would use that Tm on another pokemon more deserving.

If it was the only Dnite you could ever have, change to Outrage asap imo.

Things could change soon tho and you might find yourself with the opportunity to get other Dnites, in which case it might make sense to hold off on changing the one you have now.

Caught a lv20 1880 Dragonite @77% today DT/H. Considering if I power her up. I have 2 already with DTO 3K+

I normally wouldn't power up a non shiny in the 70s but this could save me a lot of candy. Thoughts? I have 220. Dust is however an issue

Another vote for dt/h. Specifically for machamp raids tho. Dt/o better if you want to take down gyms. But I've been using garbage for that now that it's so easy

DT/H incredible vs. Machamp boss and also Exeggutor boss. Dragon is only SE vs Dragon so Hurricane gives you some type advantages and still mega-DPS. For pure Dragon I still love DB/DC.