I think it is clear that Thor is slightly stronger, this was mentioned in the Korvac saga, where he couldn't quite lift Thor's deadlift.
However in the same arc, he mentioned he was tougher than Thor and his speed and strength combo made Ultron fear he was had the best solo chance against him (bearing in mind Thor actually finished the job).
Thor moved to hyper speed, like an entire shift to match Gladiator in that old FF run featuring the dreaming Celestial. There's no way Wondy could do that. But he has shown almost instantaneous reflexes. I'd say Wondy can access his speed quicker than Thor, but Thor can tap into greater speed. For me, Thor has several levels above Wondy that he can access. Classic Wonderman was merely a brick. Thor can fly through space. The demands of that pretty much inform everything else. Remember when he was 'cracked' by Hulk in that alternate timeline story by Peter David.