One of them is far more effective. Guess which one?
I couldn't get that video to work -- it kept going to the NEXT video about concealed carry. While I was there, however, I took the time to look at several other same-topic videos on YouTube, including one by Larry Vickers. A surprising number of folks say "X is best, 'cause that's the way I learned it..." That seems dumb, and ignores differences in gun function.
I agree with Vicker's suggested approach -- which is to use the offhand thumb to release the slide (if you're right-handed), but they make the point, that the best technique is GUN and SHOOTER dependent. Some guns, like the Beretta, as shown in the Vickers video, don't take well to the hand-over method -- as it's easy to decock the weapon if you're not careful.) As noted below, I don't always use the "Thumb" of the offhand, but do use fingers from that hand.
I would note, too, that the U.S. Military now teaches the slide-stop release as part of its handgun training. An acquaintance, Larry Brown, who has worked for years as a trainer with Special Ops troops at Ft. Bragg, says that is the approach used there. The change in training and practice was made after a lot of regular troops experienced failures of their guns to return cleanly to battery in combat situations; the situation wasmade worse by bad environmental conditions (dirt, sand, hot and cold temperatures), and the wide-spread use of gloves in the combat zone.
The biggest disadvantage I see to the
OLDER STYLE slingshot approach, in which you grab the rear of the slide, pinching it
like you hold the projectile in a slingshot, forces you to drop the gun away from the target and causes a major move of the weapon. That is very time-consuming, when time may be critical!
Releasing the slide
cleanly, using the
OLD style "slingshot" release is still a FINE MOTOR SKILL (but most proponents thought otherwise), and not doing it properly can lead to problems -- as we found in Afghanistan and Iraq. I don't think many instructors now advocate the old Pinch/Pull/Release-style slingshot method.
The HAND-OVER approach is much better "slingshot" approach and unlike the "traditional/older" slingshot technique, doesn't force the shooter to take the gun dramatically away from the target. You can keep your eye on the target and the sights in that same general area!
Back when I was shooting more regularly, I found that the slide stop release worked best for me if I used several fingers of the off-hand instead of the off-hand thumb: that gave me a BIGGER (practically speaking) "finger" to find and depress the slide stop. The decision was made easier for me, since only the Glock 34 I sometimes shot allowed me to use the strong hand thumb without changing my grip... With most of my other guns, it wasn't even close to practical to use the strong-hand thumb.