Well I'd prefer a top defensive midfielder if there's a wish list. A winger and a centre half too, but I think the DM would have a huge impact on the stability and balance of our team - support defence and allow Bruno/Donny/attacking players to focus on what they do best.
From the limited amount I've seen, I like both of those players though different attributes (counter attacking v predatory, hold up capabilities). Also good ages and both appear to have a confidence and desire to win/put in the effort... which spreads across teammates in the same way negativity/sulky body language does (Martial).
Honestly? I'd need to see a lot more, there are loads of posters who've watched plenty of their games - they're better placed. If close, I would go with whoever I thought fitted our system of play the best or gives us the right options for when we need to have a Plan B.
Right now, I guess counter attacking ability, age and release clause amount (if true at c£65m) would say Haaland.
You?