If you're planning to skin uphill regularly, touring boots (also called AT boots) are worth the investment. They're significantly lighter than resort boots and have a walk mode that lets your ankle move freely for long uphill climbs. They also feature tech-compatible toe and heel fittings that work with touring-specific bindings—something regular alpine boots lack.
The trade-off is that touring boots sacrifice some downhill performance. They're softer and less rigid than alpine boots, so you won't get the same edge-to-edge responsiveness and power transfer on steep descents. For short sidecountry laps near the resort, you might get away with a freeride boot with a walk mode. But for full backcountry days with lots of vertical, touring boots will save your energy on the up and still ski well enough on the way down.
Avoid buying touring boots if you only ski inbounds—you'd be giving up downhill performance for features you won't use.