I have the Aqueon. If I had it to do over again, I probably would have gone with the Python. The Aqueon has the plastic connectors, which leak, and the plastic threads make it difficult for it to stay on the faucet. More than once it has popped off and water has gone everywhere. My fiance ended up getting a metal piece to use and it stays connected better.
Also, I don't know if the Python is this way, but the Aqueon has NO suction, even with the water turned up as high as it will go. If I want to get debris out of the tank, I still have to use the vacuum. It also uses A LOT of water and drains slowly.
Usually what I do is drain my tanks with a bucket and vacuum and use the changer to fill them back up. Uses less water and takes less time.