You shouldn't write any of the strikers off because Arsenal also need a player that is good with the ball and it will be bad that Viktor Gyökeres will be that kind of player that find it hard to battle for the ball and it will look like the Gunners are always playing with a man down, I'm just saying. Both players are good which I'd love Arsenal to get both but where the problem lies is how stingy the Gunners are to spend to get quality players, with time one of these 2 players might change their mind or even move to a rival club if Arsenal ain't serious.
Benjamin Šeško didn't score up to 20 goals in the Bundesliga doesn't mean he couldn't get those figures in the EPL and it could be that Šeško will even score more than Gyökeres if both players plays in the EPL. Arsenal style of play will make any good striker to score more than 20 goals, imagine the Gunners made Kai Havertz get 9 goals when he's not a proper number 9 then what if they had a number 9? It will be more than 20, is best they decide which of both strikers they want.
Though am not an arsenal fan, but am really not that convince with this two striker arsenal are trying to sign because sesko is not good enough in my own opinion, if he can't get up to 20 goals in the German bundesliga that we all knows that produces a lot of goals, then their is a higher probability that he wouldn't get up to that figure in the EPL.
Then as for Gyokeres, even though his numbers looks impressive but am still a bit skeptical if he is going to flourish in the English premier league, though I might be wrong but that is why I still can't be confident that he can deliver the goods for this arsenal side, but if it were for a player like victor osimhen that is a fighter, I would have been very confident that he will deliver for this arsenal side.
It surprises me with what you said he can't score more than 20 goals in the EPL, he did it in Bundesliga and I believe the new club if Arsenal gets him things will turn out for good for the player, he'll score more than 20 goals because Arsenal is a team that provides big chances towards goal. The only problem we have to worry about this player Šeško is him being an injury prone player, if he is then the Gunners need to be worried instead choose to go for Gyökeres. Either of them can be injury prone if care is not taken but I wish they go for the best to give them more goals to win a title.
If you talk about Arsenal going to Victor Osimhen that's if it will happen I'd say it will be something great for the club, it will be like when Arsenal had Robin van Persie who was outstanding. But Arsenal can never go for Victor Osimhen because the pay is not something they are willing to let out even if Osimhen is coming with all the trophies to give to the Gunners they won't spend on him but my fear is the way they go about getting players they don't need is alarming. Now they're going for Madueke tomorrow might be Jackson, with Arsenal anything can happen.