Hi Gary, and welcome to the forum.
Are you waiting on the BitZero being in stock before ordering the XXL, or the other way around?
If it is the BitZero you’re waiting on, I would suggest you order the XXL and look elsewhere for the BitZero - or wait for it to be in stock.
At least you’ll have some time to get used to the machine!
Also, take a look at this.
Good luck 