For male skiers, a men's-specific hip protector is usually the better choice. These are cut to match male proportions—specifically the narrower hips relative to the waist—which means the protective pads sit exactly where they need to be over the hip joints. Proper pad placement is everything; if the pads drift or sit too far apart, they won't protect you in a fall.
Unisex models try to accommodate everyone, but that compromise can mean pads don't align correctly on male hips. The waist-to-hip ratio is different enough that a unisex waistband may not stay put, letting the pads shift around while you ski.
If you're a male skier shopping for hip protection, go with a men's-specific model whenever possible. The fit will be more secure and comfortable, and more importantly, the pads will actually be in the right spot when you need them.