Wet hair hangs 50% longer than it actually is when it’s dry. A dry haircut can help your stylist make sure they don’t accidentally cut more than you really wanted. [5] X Research source
If you wear your hair both curly and straight, a wet cut might be a good option, because it is a precision cut, but you must always always seek a professional who’s trained in that method.
If you want a haircut that will look the same at the salon as it does when you’re out and about for days to come (without employing too many tools or products), a dry cut may be the right option for you.