I agree with hubby. Its lovely just like it is

I like those 2 borders.

I like it either way myself.. your quilt is beautiful!!

Ditto.

I love batiks and I love your quilt.

Your quilt is lovely and I don't think you could go wrong, either of the choices you presented are nice.
If it were mine I would have made the border wider and close to the darkest color in the quilt to frame it out and then do the piano key and a binding of the dark color. If I use a color that is much darker than my quilt fabrics I go small with it and then add another border similar to the quilt colors and frame it in the same dark fabric.
You will have as many different ways to finish it as you have people but it's your quilt and you know what you like. I often see quilts with fabric choices that just aren't my choices and I love them.

I think the border looks great and I also think it needs another border in similar tones to the quilt before you bind it. Otherwise,(in my opinion only) I think it looks like you stopped because you ran out of material and not because the design looks finished.
I am going to try this slicing on my next one as you have inspired me.

I really like your plain boarder, it seems to produce a picture effect as well as pick up on your purples. Very nice quilt.

It's done and beautiful.

Love It!!