Which Seattle Mariners Address is best?

[HombreBueno23]

I see two listed, are they for different purposes? Is there a difference in success rate?

c/o Seattle Mariners
P.O. Box 4100
Seattle, WA 98104

vs

c/o Seattle Mariners / Safeco Field
1st Ave S & Atlantic
Seattle, WA 98104

Thanks,
Nick

[marinersfan]

First one