No pro, but my experience says use a snap swivel & split ring if you're thinking loop.
Loops and duolock snaps (tied on w/o swivel) can create a slight cant to one side. You essentially just want the spoon to wobble, not spin or go lop-sided.
The swivel will keep the angle & wobble right and the snap allows for a little bit of the floppy flutter you're trying to get with the loop.
Maybe reduce speed a touch to keep it from spinning on the swivel.
Also, the loop can abrade in the spoon's eye, or if it has a split ring, get nicked by the ring itself or slip inside the splits.
Cheers!