As anyone who has read 'Brainsex' will tell you, men and women have different qualities. Women tend to score more highly on intuition and empathy than men, for example. Of course, that is an "on average" statement. You will of course find women who are physically stonger than some men, just as you will find men who are more intuitive than some women. There may be qualities that are required in your story that might better suit a female character. But equally, I would say that there is nothing wrong with having a physically strong female character. Properly written, the 'warrior princess' can be just as credible a character as the 'wise woman'. Indeed, both could be credibly combined in the 'wise female warrior'. I would see nothing wrong with a female Aragorn-type, as long a she was credibly written.
Although none of them, of course, would be able to read a map properly.
*Ducks flying objects*