What would make you choose a man or a woman while recruiting an employee for a new managerial vacancy?

Gender is not criteria in the selection process or this will be considered discrimination.
Yet, it might be business need and only in this case it will be criteria in the selection process, yet such cases are very few.
The cases that require gender preference are only limited to the jobs that require physical efforts (preference will be for men) and this is for labors and site civil engineers for example.
while preference will be for females in other jobs that are with direct contact with women clientele only like hairdressers or nurses in Gynecology for example.
I believe these are the only case that gender preference can be added to the selection process.

i will accept the good between them

I will select anyone who is suitable and can work perfectly in my company.

Experience:)

Man off course, Man is better manager than woman, woman has many problems to work with men, Man can easily say anything , deal anything and control anything.

It depends.
Women are better in dealing with pressure and stress than men and can absorb a lot of crap, but they tend to be emotional.
Men on the other hand being physically stronger would be able to stand the heat and driving and usually when making decisions are not emotional.
When it comes to money men can get more money than women.
they are more financially oriented, while women are more into the passion of work and ambitious.

A fair and objective recruitment process relies on competence and the ability to the job as key criteria for selection as opposed to factors such as a person's gender, marital status and so on.
Opting to make selections based on the gender of the candidate leaves the organisation open to possible legal and human rights implications on the basis of what is essentially discrimination.
This also creates a negative impression of the organisation within the business and job seeking community at large, especially in this day and age where discrimination is an extremely sensitive topic.
Having said that, some occupations are indeed gender specific or gender sensitive as in the examples suggested by Samar Abu Shaban in the discussion earlier on and these roles need to be assessed accordingly.

Gender sometimes is important in the selection process in some jobs specially in physically construction but Experience is the most important thing

Certainy gender isn't a criteria to justify a person ability to handle a mangerial postion belive its all depend on the merit of a person.