The only difference is the tinted glass/colour.
At least for the XL, there's an option for a slightly darkened glass and one noticeably darker.
The ROG thing it added a foil-like ROG adhesive to the side glass. It can be easily removed sliding a Stanley blade at angle, against the glass.
The razer, I'm not into much details, bit I believe is similar to the ROG approach.
Between the light and darker glass, personal choice. None will block the RGB, but when the RGB is off, the darker version won't show as much of your system.
Another thing to note,
https://www.overclockers.co.uk/clearance/cases?sSort=3&ckTab=0&ckSuppliers=347. I need to confess, I'm kind of hyperactive and change system very often, I was the kind of children who would spend more time taking toys apart to understand how they were made than playing with them, and going with the B-Grade was a good thing. Bought about 3 or 4 O11s before, and none was defective. Was either open box or some minor damage to the box, but all the cases were as new. All had their protective plastic film in place. Also, if anything is damaged, it can be returned. Overvlockers customer service is very, very good.
Yes, I owned a regular O11, one O11 Air (don't bother, horrible filters), O11XL Black, O11 XL White, O11XL Black, them give up on watercooling.