DARKGLASS XU vs AOU 

I've been in a similar situation. Having owned an AOU before and the XU now it's very hard to decide. The AO seems easier to dial in, but the XU has a lot more options. Plus the built-in compressor saves you the necessity to buy a separate one :)

For some reason I can’t get my compressor to come on, on my x ultra and I’ve owned two and neither one I could get it to come on