All things being equal, I would prefer a ceramic bezel insert to aluminum for its increased durability. That being said, it's my understanding that Omega chose an aluminum insert for the "standard" 300 Heritage model because it is more in keeping with the vintage character of the watch. It's also my understanding that the aluminum insert has a special coating which makes it substantially more durable and scratch resistant than a standard aluminum bezel, but still considerably less so than ceramic. I've had my 300 since earlier this summer and the bezel has taken a few hits with no damage so far. I actually really like the fact that the bezel is lumed. Not that I'm timing anything in the middle of the night, but if I were, it would be a nice feature. As shown in my photo above, the overall lume on the watch is just outstanding and, once charged, it lasts through the night.