TweetPropionate is stronger than cypionate on a mg per mg basis because the ester is lighter and the total mg weight contains more testosterone. Also, propionate has a shorter half-life and requires more frequent injections to keep blood levels stable. Other than that there is no real difference – they are both testosterone.
There is usually less water retention noticeable at moderate dosages of propionate than there is with moderate dosages of cypionate, but high dosages of propionate will cause as much water retention as any other testosterone.