In my opinion. Cooling wise only + accoustics.
1. Sapphire vapour X (different to the tri X, uses a vapour chamber) Tri X
2. Gigabyte windforce
2. Asus STRIX
3. MSI frozr
4. XFX
5. power colour/HIS
HOWEVER, all these coolers do their job quite well. They all cool the GPU perfectly. This is just my PERSONAL order of list.
You should make your own choice based on looks of the cooler, and you can look at temp charts for different models. Although I think personally Sapphire are the best acoustic/cooling wise for AMD cards (as they only do AMD cards). Also Gigabytes new windforce design also keep the card cooler.
So in my OPINION, Gigabyte and Sapphire are slightly above the crowd, possibly by 1-4 degrees, but any of these cards will deliver adequately the cooling needed.
ALSO DO YOU MEAN THE NITRO CARDS, AS VAPOUR AND TRI-X ARE NOT FOR THE R9 380?
Also I believe the Sapphire vapour X (depending which one) is actually a custom PCB. So is a little more expensive
-good luck, make your decision based on pricing and the look. You can look up reviews of the cards to see their temps.
here is one.
http://www.tomshardware.com/reviews/amd-radeon-r9-390x-r9-380-r7-370,4178-11.html
On temps this MSI r9 380 got a max of 66 degrees on a gaming loop.