A standard neck balaclava extends to mid-neck or just below the collarbone, which provides solid coverage for the majority of resort skiing conditions. It's the sweet spot for most riders—it tucks easily into your jacket collar without bunching up, and keeps the chill off without feeling restrictive or overly layered.
The main thing to watch for is that a standard neck length can sometimes pull out of your collar when you're actively turning your head or looking around. If you're doing a lot of aggressive skiing or your jacket collar sits low, you might occasionally feel a draft at the lower neck.
For typical resort days in normal winter conditions, standard neck coverage gets the job done. Save the extended neck options for brutally cold days or backcountry trips where sealing out every draft matters, and consider short neck only for spring skiing or if you always wear a high-neck base layer underneath.