Tie. I agree with Axiomus. Both are equal.
I have always seen ethernano residing in someone's body as chakra case in Naruto manga. A wizard contains amount of ethernano in their body. DiMaria's hax magic indeed can be cast really quickly, but she needs to release her ethernano first, as seen in chapter 467:
Lyon, Sherria, Toby, and Yuka look shocked.
The reason why it was too late for Brandish to realize that DiMaria was there around them Natsu and co (as seen in chapter 500) could be probably because 1. DiMaria hadn't released her ethernano, and/or 2. Brandish hadn't released her ethernano before Neinhart walked in (she only cast on herself (Giant mode → normal size mode)). After she tried to Command T Neinhart and failed, she noticed DiMaria was stalking them...
So, the moment this match starts, both have to release their ethernano first