If they're both actually good enough otherwise it's extremely important not to sign them. Antony I have some faith in as posters I rate seem to think he'd class. On Nunez the talk and stats of his lack of involvement in the buildup scared as we keep digging ourselves into a non possession based hole we can't climb out of.
I think it's something that can be adapted for, you just have to ensure his other qualities are good enough. By all accounts he's a very hard worker off the ball and defensively, which is good for any pressing system. He is young and has good pace and power and clearly has an eye for goal. Ideally, we would bring in a RVP/Lewandowski/Benzema/Kane... But there aren't any of them anywhere close to the required level around. City are signing Haaland, and Darwin is pretty much the same style of player, as is Lukaku. Lukaku has problems with mentality more than anything, and that's what always stopped him from doing what Haaland has done already. Darwin looks good in big games and doesn't seem lazy at all, but he could be an excellent #9 for us in the same vein. We just need the supporting cast and build up to be set.
Put it this way, if City were signing Darwin, I think he'd smash it because he'd have the work rate and the movement/finishing to be perfect. Haaland is just the peak version of what you hope Darwin turns into. City have their system and build up all set. We have no idea, though the hope is Ten Hag can sort that out. If he does, then someone like Darwin might suit him really well. Sancho for example had a great partnership with Haaland, so might strike the same relationship with Darwin. Bruno would have someone making those runs in behind that he loves, Etc etc. Antony seems perfect to balance that front 4, and you have a group of players with a good blend of creators, shooters, pace, power, work rate, ability.