Who to ask to be a bridesmaid?

Hey guys. Trying to figure this out. So I ordered two girls almost the same thing. One of the girls I’m considering we’ve only known each other for a little over a year and just started talking here. Was a real busy weekend with Easter so I haven’t heard from her at all. The other is my future sister in law. I don't know if I want her in the party itself or just as a personal attendant. Only having 4 and I already have 3. I did order my friend here the correct bag for the bridesmaids but also ordered a similar bag for my future sister in law. Who would you choose here? I know my future sister in law would make it all about her. Just need your thoughts on this here.
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Update: I just ordered the same bag for the future sister in law and can give as another gift itself.
Who to ask to be a bridesmaid?
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