I prefer QR for his B skill, but i do want to put TA on him. Still have never pulled a Roy though.
I'm also considering putting a healing special like Sol on him. I don't think Noontime would heal for enough and Aether takes too long to charge, but Sol should fully charge when he gets attacked as long as the attacker doubles (attacker>Xander>attacker>Xander w/QR), allowing him to heal up during player phase.
But i'm running him in a horse emblem team w/ Elise, blade tome Cecilia, and Jagen (gonna be replaced with Reinhardt once i finish training him to max level), and with Hone and Goad buffs he'll be at 34 SPD, which means he won't get doubled so much.
Also not sure if a healing special is really needed since i'm running Elise.