When it comes to club ownership it's not really a question of who is the most desirable, but who is the least objectionable. You don't really achieve the level of wealth that affords you such opportunities by being a good person. So no matter who buys the club, they're more than likely going to be a villian.
That being said, it'd be pretty disappointing if the club were purchased by the Qataris or the KSA. Being owned by greedy capitalist pigs is one thing, that comes with the territory of owning a sports franchise, but being owned by a state whose identity goes hand in hand with corruption, abhorrent treatment of the LGBT community, and the subjugation of women introduces a level of shame and moral failing to Manchester United.