I haven't really used the non-Victorinox or non-Wenger can openers so I can't compare beyond those. Of the three Victorinox+Wenger designs, the standard Victorinox is the best IMHO, followed by the claw style of the old Wengers, and the Victorinox combo tool. They are work fine, but it is mainly a matter of how much time and effort it takes to accomplish the task.
As an aside: a Victorinox is a multi-tool in the literal sense. The "Swiss Army Knife" expression is a advertising thing, which stuck as a general reference. Frankly, I use the scissors in my SAKs more than I use the blade. Also, the law in my area is the "need a valid reason to carry a knife"-type. So if anyone asks: I'm carrying a multi-tool; the fact that it also includes a blade is a secondary consideration.
As an aside: a Victorinox is a multi-tool in the literal sense. The "Swiss Army Knife" expression is a advertising thing, which stuck as a general reference. Frankly, I use the scissors in my SAKs more than I use the blade. Also, the law in my area is the "need a valid reason to carry a knife"-type. So if anyone asks: I'm carrying a multi-tool; the fact that it also includes a blade is a secondary consideration.