First things first: get the boot that fits you best. There are differences in fit between the two, the Atomic being lower volume, especially in the rear foot (ankle & heel).
I'll give you a rundown on the Atomic Hawx Ultra XTD, just the facts about it and you can come to your own conclusions.
This is a boot that is purpose built as a one-boot quiver for both resort use and touring, but the current 23/24 version is much better suited as a resort boot that can go touring when you want to.
We use a heat-moldable PU shell
and a PU cuff. PU (polyurethane) is what is used in dedicated alpine/resort boots because it is more damp, more progressive, more durable, and better for boot fitting. When you want to use a boot in the resort, you want this material. It does add some weight, but the other benefits it brings when skiing the resort are more important than a few grams for the occasional touring this user tends to do.
With our PU, the boot is also completely heat-moldable, so if you need extra space created, this boot easily adapts to your foot shape during the boot fitting session.
Our liner is made with and from the same materials that we use in the regular, fixed-cuff Hawx Ultra. It's heavier but also built with foot hold, downhill performance, and longevity in mind. We used to make the liner much lighter, but enough people complained that it didn't have the foot hold or skiing performance of their regular Hawx Ultra. Well, now it is literally the same as the regular Hawx Ultra liner but with an Achilles flex zone for touring. Again, made for the resort but optimized for touring too.
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The liner also has a special material inside it that we call Mimic. Mimic is not a heat-moldable foam but instead a heat-moldable plastic (what creates that special ankle shape of the liner). Mimic is given a pre-shape to fit a lot of people, but when it is heated in our oven, it becomes totally moldable, fully shapes to your anatomy, and hardens in that shape for forever (or until you remold it again). For a "stock" liner, this is a pretty baller technology. Below is what the liner looks like after heated and squishing the ankle with my hand- it took the impression of my fingers and has stayed that way for over 4 years now. I still use this liner in my clinics.
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We also make an aftermarket accessory called the Gnar Bar, which is a solid piece of metal that replaces your ski/walk mechanism for added stiffness, responsiveness, and stability. All ski/walk mechanisms have a little play in them, which you can sometimes feel. They don't inadvertently pop open, but you can feel this play. When you know you'll be skiing in the resort for a while, just unscrew the ski/walk mech and put the Gnar Bar on instead. This allows you to turn your hybrid boot into a fixed-cuff boot and squeeze out every ounce of performance for those resort days. And when it comes time to do a big touring day, just unscrew the Gnar Bar and swap back to the ski/walk mechanism. It's like having 2 boots in 1.
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Check out Lee's review here on NS for more details:
https://www.newschoolers.com/news/r...ltra-XTD-130-Gripwalk-BOA-touring-boot-review