When a person has more than 1 gurus, then at the time of "Guru Pournima", whom should he/she worship.
(some Gurus are still living, but far away located. Other ones are "brahma leen, i.e. left their mortal bodies).
Like any library, Hinduism Stack Exchange shares great information, but does not offer personalized advice, and does not take the place of seeking such advice from any Acharya, Pundit, astrologer, Guru or other trustworthy Counselor.