No, Arya wasn’t necessarily the better fighter. Brienne may simply have given her the room to shine, and that’s worth debating.
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Brienne was stronger, taller and had years of experience in conventional sword fighting. She had also proved herself against formidable opponents. Arya, on the other hand, brought something different: speed, agility, precision and an unpredictable fighting style shaped by her training with Syrio Forel and the Faceless Men.
But that doesn’t mean Brienne was deliberately losing. She was sparring, not fighting for her life, and Arya’s skills genuinely impressed her.
So, did Arya actually outclass Brienne, or did we mistake a brilliant sparring performance for proof that she was the better fighter?