[Grammar] Who from both of you can speak English fluently?

[UM Chakma]

Who from both of you can speak English fluently? Is this sentence grammatical and correct? If not please help me to correct it.
Who from all of you is the best in English? Is this sentence grammatical and correct? If not please help me to correct it.
Thanks,

 

[Rover_KE]

'Which of you two can speak English fluently?'

'Which of you is the best English speaker?'

Other alternatives are possible.

Rover

 

[UM Chakma]

My sentences are wrong, aren't they? What are other alternatives please?

 

[Barb_D]

Just use the ones Rover gave.

 

[Tdol]

My sentences are wrong, aren't they?

yes, they are; we wouldn't use who.

 

[tzfujimino]

However,

"Who can speak English more fluently, you or Ken?"

I wouldn't use 'which' in the construction above.

Is 'which' acceptable there? (No, I don't think so.)