In my stage show I use a mismade bill that just has one seam of the bill on each side.
Most magician’s use the mismade bill that has two seams:
I think the single seam is easier to visually process from the audience and at a distance. I decided to do some testing at the fair that I’m performing at and I’m getting bigger reactions and faster reactions from the bill with a single seam than with two seams.
It’s such a small thing, and in many context’s you may want to use the two seam bill, like if you are tearing a bill into quarter, of course it makes sense to use the bill with two pieces. In my routine, I turn the bill inside out, so there’s no tearing.
The important thing is to try new things and see if maybe you can get a better reaction doing something slightly different.