Generally, the difference is that bi is attraction to similar and different genders, and pan is attraction regardless of gender.
It mostly depends if you have a preference, and honestly, whatever term you like the best.
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0 ups, 2y
Ahhhh, thanks for clearing that up
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0 ups, 2y
Bisexual does not actually mean two genders it means that you are attracted to genders similar and different than yours. Pan means that you do not have a preference for any gender but love the person instead