So, you got accepted into more than one school and they all sent you an I-20. What do you do?I think it goes without saying that you have to talk to one school and tell them that you won't be attending because you got accepted somewhere else.
You really can't do anything with two I-20's. You have to present only one at the embassy.
I don't think having multiple I-20s is a disadvantage in any way. The Consular Officer sometimes asks during the visa interview about other schools that you've applied/got accepted into. Just have valid reasons why you chose your present school.
Hugs & Kisses,