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Well, for me, same-sex marriage is full of dis-advantages, but I still respect it. 

But here are some advantages that I see.
1. Equality
When same sex marriage is in our community, boys and girls are equal to gays and lesbians. Same-sex marriage is all about equality.
2. Self-esteem of Individuals
When same sex marriage is in our community, self esteem (pagtingin sa sarili) of every gays and lesbians will raise up. It is because they have the right to marry someone with the same sex. 

But still, this is my opinion. You have to answer this question your own, I am just giving you some clues and guide on how to answer this question because we differ in the way that we think. :)