scheme depends on personnel and with a given roster, that's what dictates your play. So with that, we're not equipped for the 3-4, however it is a fine system (not a strategy or tactic) for creating confusion.
Since these systems go in trends, they can be more or less difficult depending on the trend at the time. Currently, it's back in vogue, however, it's been a round for a while.
Never the less, a strategy for forcing a team to pass would be a d gameplan and a tactic would be blitzing, double teaming, and switching coverages.
So, thanks for supposing that I wouldn't know the difference, but this isn't the cowboys first rodeo.
Never the less, I think that the 3-4 is a superior system because of it's flexibility and with the advent of the TE as a power receiving threat (Gonzalez, Gates, Shock) then the middle and short field becomes a wide open target that is more difficult to navigate around the 3-4.