Any of the following should do. The answer can be either one of the choices given. Who of the two does a better a job?
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Miriam MozruiWho of the two does a better a job?That is not very natural. 'Which of the two ...?' is better.
Miriam MozruiWhich of the two is good at their job? Answer: He is. She is. Him. Her.That implies that one of the two does not do a good job.
Who does their job better? Him or her?That's OK.
fivejedjon Miriam MozruiWho of the two does a better a job?That is not vert natural. 'Which of the two ...?' is better.Miriam MozruiWhich of the two is good at their job? Answer: He is. She is. Him. Her.That implies that one of the ttwo does not do a good job.Who does their job better? Him or her?That's OK.It is okay? I didn’t realize I needed your validation