My only caveat on a frenulum piercing is that you are only going thru a thin bit of skin in an area that gets a LOT of tugging.
ITs kind of a balance between the gauge being large enough to not tear the skin easily... and the gauge being so big that it actually gets tugged on a lot more forcefully...
My advice would be to get a PA or an apadravya or ampallang ( all the way thru the entire head, either vertically or horizontally, respectively )
I prefer a piercing to transect some actual meat... or tougher tissue than mere skin.
A PA passes thru the very tough lining of the urethra.
Although an option that can make a frenulum piercing less likely to pull out iis to get a ring the goes thru the piercing, and then encircles the entire glans, just behind the flair of the corona. Tight enough to be snug when erect, and not pull off the head when soft...