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They won't to as well on hard pack as Volkls non-playful freeride skis (Gotama, Shiro, Katana, etc) because the One has a tapered tip and tail, making it surfy and fun in the deep, but harder to carve on hardpack.
I skied the new life for years and it was great. I just switched to Volkl last year, I ski the two which is just a slightly larger version of the one, and I like it more. Honestly the skis look really similar, the rocker profile and widths are very similar. However the early taper of the one and and softer flex compared to the new life makes it a better preforming ski. I'd go with the one.