Both are scored the same so no issues there. Point loss occurs when either is not performed correctly, so keep an eye on the dog and determine which type of finish will result in less mistakes being made (points loss).
For example, in the flip finish the dog that knows how to move his rear end sideways will always have an advantage over a dog that only turns directions by using his front end and the handler typically walks around the dog when doing the about turn, in this case the go around finish will be preferable as it still allows a sloppy dog/training to look good. So key items to consider when choosing the finish are,
1. Dog's rear end awareness (your job as a trainer)
2. Is dog fast or slow (size does not matter)
3. Which style will result is less errors