Kane at united would be pretty good because he played in premier league all his life which means that he could be a great player there and could end up with a good amount of profit while playing for a team that plays in the same league.

At Bayern Munich he will most probably win a cup as well, they will most probably win the league as well, if they don't then that is going to be something troublesome and if he goes to United there is no guarantee of cup but nobody would put any pressure on him to win at least. That is why I believe that the least riskiest option would be United. All these are mute points as Tottenham asks for a lot of money and he is going to be not so young when his contract is over so either now or never for him.