Thumbless grip has two disadvantages. One, you can't squeeze hard enough. Two, it's way too easy for it to fall forward and crush ya.
I say look at the best. Mendy says it's called a "suicide grip" for a reason
Though a few use and firmly believe in the grip:
Be careful. If you plan on competing, some feds like the IPF have rules against a thumbless grip. It would suck to get use to that grip and find out you have to switch at the last moment. Better check with your federation first.
Don't discount the thumbless grip. It puts your elbows in a better position and lets the bar ride more over the top of your wrist so you don't get the wrist problems from your hands bending back with a heavy bar. I've benched this way for years and have never lost the bar. You can still grip it tight with your fingers.
I feel like with the thumbless grip the weight is being more evenly distributed, as it feels flatter. It helps keep my elbows in.