I have no skin in this but asking price $1300 obo you have 2 offers of $1200. That’s what OBO means. Take the first one that can bring you the cash that’s only $100 less then you’re asking price. If you a firm at 1300 then get ride of the OBO on your add.
Sorry I see you have OBO in the listed price then $1300 firm in your description. That’s confusing