Stories of Tie Up Games

I'm looking to buy a new harness gag and I want to know if any of you have tried both styles of chin straps :
- Directly under chin
- Wraps around and ties back behind neck.

I have one that straps directly under my chin and I quite like it because it forces the mouth closed when you tie It tight, but I'm very curious about the one that wraps around behind the neck and the effect when your head is tilted back (which is kind of my I use for a harness gag)

Does it make everything tighter of kind of pulls down on the ball and forces the mouth a bit open?

Thanks in advance!

You are correct, just as the strap under the chin pulls your lips closed tighter as you move your head the strap behind the neck pulls the ball tighter up into your mouth as you tilt your head back and forth. If your head is tilted back in a hogtie position for example it can get a bit uncomfortable very quickly, just my opinion