Hello,
I have both chargers and they are both really good.
The Orion one does not make much noise at all, the Cell Master have allot of fan noise, very annoying..... Also, the Orion one has the motor run in feature which is really good, the CTX does not have that!
The temp sensor on the Orion Advantage is also very trick, attaches to the cells with a magnet and stays in place!!
With almost the same price I would definitely go for the Orion Advantage Charger, no doubt!!