I think both are true, although I would lean less towards Jon’s tactics being dumb and more that he didn’t actually use any because he went charging off on his own and spent the entire battle as a mere foot soldier.
If I might add something here, the underlying problem with the decisions of both characters is the show’s persistent attitude of “noble = stupid.” Jon and Sansa both got hit with this in different ways – Sansa in being arbitrarily untrusting and needlessly manipulative, Jon in doing…what Jon did.
I second the motion.