I intend to apply for admission to a variety of law schools. However, I believe that suggestions for choosing recommenders are very vague and subjective. In my particular case, I work very closely with two persons and one of them attended Harvard, while the other one attended NYU. Both of them know me very well, but the one who attended Harvard holds a higer position in the firm than the one who attended NYU.

If I intend to apply to NYU, do you believe my chances will be better if I ask for a LOR from the Harvard graduate with a higher position or from the NYU graduate because I would be getting a recommendation from someone who attended the university I'm applying to?

Thank you for your answers.

Yes, the rules tend to be vague and subjective simply because all applicants have different circumstances.

Why not just ask them both to submit letters? Although NYU only requires one letter of recommendation, applicants "may submit additional academic or professional letter(s) if they wish to do so."

http://www.law.nyu.edu/graduateadmissions/application-required-materials

In theory, the alma mater of the recommenders shouldn't matter, though.