Thanks for the feedback. Okay, so they really are very similar... but how about this: Which one is quieter?

So between these two, which one would be best for someone who is just starting on a APAP?

Wow, I am shocked! I downloaded both the user manual and the data sheet for the Philips Dreamstation and all it mentions is to "connect AC power". Nowhere in the specifications is there an electrical specification section with more information on this. Luckily, the brick itself says 110-220v 50/60Hz...