The Woodpeckers "Semble" are indeed, Ehoma. Having used them for a couple years now, I'll pass along a couple things I've found. Keep in mind, I work for Woodpeckers, so my viewpoint is not completely objective, but I've used every Bessey parallel jaw clamp design that has ever been sold in the U.S.
Both clamps are supposed to slide closed when you push the handle in and slide open when you pull the handle out. In "neutral" the theory is they won't slip either way. I find this action more reliable on the Semble than on Bessey. Don't know why.
As a person who has lived through several trips around the sun, I really like the swivel handle of the Semble. I can put more squeeze on with less hand strength and I feel I have more control over the pressure when the handle is folded out.
The jaw caps are captured on the Semble and won't slide off like the Besseys.
I would give a very slight edge to the Bessey in terms of "beef". Elements of the clamping head seem just a little bit heavier.
As shown in a Deep Dive video I did when we first released the Sembles, it seems to me the parallelism of the jaw goes slightly in favor of Semble.
In my home shop, with a rack that has some of each, I reach for the Sembles first, my old original all-red K-body Besseys second and the Revos third.