I believe they are in essence the same . Which is ironic as they debate each other so much . They both come from the same pot. Jacob Arminius under Beza never fully left the reformed camp inspite of trying to find his way out . They both Agree on Total depravity and Perseverance of the saints with subtle differences, but really leading to the same conclusions .The Armenians come loaded with the "man does" verses while the Calvinists come loaded with the"God does" verses.
I believe the truth lies in the middle with both true but God as the first Mover.