It has been my experience over the past 30 years that cards WITH borders help to hide sleights.
There seems to be some lingering rumor that cards without borders, like Bee, aid in performing a deceptive Pass or Second Deal.
Frankly, I can't speak about the Second Deal, but a white border HELPS to make the Pass more deceptive. Ditto for most sleights.
All the great sleight of hand MAGICIANS that I've known, including Vernon, Dingle, Jennings, and on and on, used cards with white borders. I figure they know more than I ever will, and so why not benefit from their wisdom.
The only exception to this has been Gene Maze, who used to use Bee backed cards when doing False Deals, but most of my recollection in later years puts a deck of Tally-Ho cards with a white border in his hands.