The EarthWatts is more energy efficient. I don't know if either of them is quieter than the other, nut if one is, it'd probably be the EarthWatts. If you don't want to spend a few more dollars on the EarthWatts and on the cable, then you could go with the other model and you'd probably be just as happy with it too. I don't think that there'l be a significant ifference in power consumption nor noise. This machine doesn't use enough power to make a significant power consumption difference between the two and they are low-power PSUs with seemingly similar cooling, so they're probably similar in noise generation. The EarthWatts is an arguably higher quality PSU, but it probably doesn't matter for you which way you go. If you don't mind spending the extra, then the EarthWatts is the way to go. If you do mind it, then the other one is the way to go.