Both Osimhen and Kane are good for Madrid job but I feel that Real Madrid should align more with the younger one. They already have issues replacing Benzema. When they get Kane, they might likely have same issues with replacing Kane after about 2 seasons or more.
But with Victor Osimhen, they will have a longer run. But another consideration why Kane will be better is because of his age and experience. His presence in the middle of Madrid attack will perfectly full the role of Benzema. Vinicius and Rodrygo will not have any reason to contest with Kane but they can easily do with Osimhen.
Isn't Osimhen more of a center forward? Kane as well. Rodrygo and Vinicius Junior prefer to play further left or right on the wing. I don't see why they would contest each other instead of complement each other, but the age issue is still to be considered for Real Madrid. Kane is a striker that will do well for a couple of years whereas, if it works out with Osimhen they would be good to go for many years. Both are extremely expensive and both options carry their own type of risk.