I think it would be a tough fight.
Visas comes from a force sensitive race, and then she was Darth Nihilus' apprentice, The exile continued her training. She became quite adept.
Where as Brianna has just begun her training, although she is still quite skilled in hand to hand combat, acrobatics, and she is skilled with a staff weapon that is like a double bladed light saber. Atris set them up so they could combat lightsaber opponents effectively, but not be force sensitive, so that her academy could stay hidden from the hidden Sith Triumvirate.
I think Brianna could take Visas, especially with her new Jedi training.