Definitely sew these by hand! I always try to sew by hand, then you know for sure where those stitches are going. Just my personal preference to share :)
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I am a sewer and i would definitively sew it by hand because I think it is easier and faster, short curves like this aren’t t so easy to tackle with a sewing machine and they must be symmetrical to look good, so I guess it would need some ripping out before getting the perfect curve, so I raise my hand for hand sewing !