Same company and both made at the Wenger factory now too I believe, but is one better designed? I read that Victorinix has reduced direct competition between the brands. To my eyes Wenger knives look better, the can opener looks totally different for example. The scissors don't have the bent spring steel like Victorinix. I've had 2 or 3 Victorinix and this spring has failed. Admittedly my first one failed when a mate borrowed it to look at it. He handed it back after half an hour with a satisfied grin on his face, telling me he'd fixed it. The bugger straightened the spring thinking it was broken!! 
