If you are staying in Da Nang, you should apply at the Ho Chi Minh City embassy for Thai visas, as mentioned in the comments. Some users have indicated that they chose Hanoi for its perceived friendliness and convenience, but the consensus appears to be that HCMC is the appropriate choice.
This is clarified when you apply. The requirement is that if you're in Da Nang, you apply using the HCMC embassy
Dca *****
The Thai Embassy/Thai Consulate in Vietnam will request for both selfie photo and receipt with full name or other documents for actual proof of physical location
dude. Obviously HCMC is better. You're officially required to use HCMC. If you apply through Ha Noi while in Da Nang, your application could be rejected or cancelled.
As for which is better aside from that.. they're going to be about the same.
Well, following from your Original Question/Post, if you are located in Da Nang, then there are no choices and you will submit your DTV E–Visa application to the Thai Consulate in HCMC, but if you want to submit your DTV E–Visa application to the Thai Embassy in Hanoi, then you need to go elsewhere in Vietnam that falls under the jurisdiction of the Thai Embassy in Hanoi