If me, I'd keep the bottom two, maybe the top one.
As for the one with serrations ... it depends on who gave it to me. I detest/loathe serrations, so there is no way I would have intentionally bought it. If I made a "oops" and ordered the serrated version thinking I ordered the pain edge, I would have given it way ASAP after opening the box.
If someone important gave it to me ... family ... for example, I'd keep it in a drawer or something, but rarely to never carry or use it. If asked: "Because you gave it to me, and I don't want to lose or break it!"