I have an assortment of plugs, nearly all of them are glass. For overnight plugging, however, it's not about having the biggest and most stretching filling plug inserted unless I'm using it to try to hold an enema overnight.
My choices are the Devi glass plug and the Njoy 2.0XL. The Devi is nicely sized, can be turned either towards or away from the prostate and is not so distracting as to prevent sleep. The rectum will seal itself around it so buildup of gas pressure can be an issue. That is easily relieved by a gentle tug on the ring.
The Njoy plug is a heavyweight (literally) and is the largest of their plug line. The fluted channels do help with the gas pressure issue, but it is the weight that you feel as you move.
Although the Devi plug has never been "pulled into me," the Njoy has such that the ring is just inside the anal ring. The edges of the Njoy ring are not sharp but put do make you aware that it is trying to pass through. If you are concerned with this, tying a simple string to recover the plug is easy to do.