They are different approaches to the same problem - carrying multiple tanks in a side mount system. The X-Deep basically uses 2 small reinforced fabric plates (between the shoulder blades and lower back) connected by webbing.
One possible negative, depending on how you are built, is that it uses a V harness design, but with the small "plate" over the lower back the shoulder straps attach to the plate above the waist and it can be a little restrictive long your sides and shoulders. You could probably convert it to an H harness configuration by getting a suitable set of plates or offset D-rings and moving the shoulder strap attachment points to the waist belt. but it'll then clutter up the waist belt a bit and compete for D-ring space.
The center mounted dump is very flexible, but it also creates a bit of a flat spot on the bottom of the wing. I'd want to back out of a few snug restrictions before I determined whether or not it was an issue.
Also, if you like your tanks to ride fairly high, you end up reaching over your tanks to reach the rear dump, and it might be a bit of a stretch. it'll depend on where the wing rides on you and your arm and torso proportions.
The inflator connection too the wing is external but well protected as it essentially ends up on the side of the wing. However, it leaves a lot of trapped gas - just as bad as the inflator on the Scubapro sidemount wing, which makes the rear dump much more critical, while being harder to re-route to a shoulder D-ring for either hand operation.
I know it's the "in" thing right now, but I've been diving with someone with a X-Deep Stealth 2.0 all week and while it's not bad looking in the water for a 40 is pound wing, it doesn't really offer any significant advantage over the Scubapro, performance wise. I was a bit surprised by that.
If you're more of a tail plate fan, you'll be happier with the Scubapro, and if you're more of a minimalist, clip to the was it belt kind of side mount diver, you'll prefer the X-Deep 2.0. Both have enough lift for multiple tank dives.
The Stealth 2.0 offers a redundant bladder option, so that might have appeal for technical side mount diver who also dives wet, but from a pure sidemount perspective redundant bladder wings are always a trade off - significantly more bulk and complexity on every dive for a capability that you'll probably never use. I have dual bladder Nomad that sees near zero use for that reason.