There are tons of YouTube comparison videos that address this.
It really comes to ergonomics (the main thing by far), battery life, and touchless controls. I'd say that performance is better on the Nexus 5, but does not really matter as much unless you are a big gamer. Camera wise, I'm not sure because the Moto X camera improved substantially after the Kit Kat update.
Anyways all of these posts I'm seeing just confirm that the majority of you are spec whores. I owned a HTC One and loved that phone. I never did own a Moto X, but it was the most comfortable feeling phone I ever used with a great design (minimal bezels). Touchless controls are one of the most innovate features we've seen a while in a phone and I do voice commands everyday for things like setting alarms, timers for when I'm cooking, reminders, etc.
I think that Pctx just made you all hate the phone and you clearly overlooked it simply because it didn't have the best specs and initially was not priced well. It's now regularly priced similarly to the Nexus 5 with the frequent sales. You can't really go wrong with either. If the Moto X+1 makes all the rumored improvements, then it will be definitely worth picking up.