supporters

[beachboy]

Among these, which is (are) the most common and natural way to ask?
- Who´s your favorite soccer team?
- What´s your favorite soccer team?
- What team do you support/root for/cheer for?
- What team are you a fan of?
By the way, what's the most common answer?

 

[Horsa]

In the UK we probably wouldn't say soccer, we'd be more likely to say football in this context.

So of the sentences you gave the most acceptable is

What team do you support?