Didn't Thor essentially ambush Thanos and still couldn't close the deal? Plus Thanos basically mocked Thor before snapping out half of existence and then bouncing back to his home planet. He was more hurt by the gauntlet than by storm-breaker tbh. Only after the Avengers ambushed injured Thanos did Thor close the deal.
2014 Thanos is a different animal tbh and seems objectively even stronger than the prime timeline version.
Thanos stomps either way.