Rapid Strike is by far the superior choice. A signature move that utilizes STAB and gives four physical crit hits in a row in one turn. Granted it’s 25 base power but when you take STAB and the crit into consideration, and if you do a choice band, it’s a pretty good sweeper. I’ll admit Urshifu water fighting type is pretty vulnerable but it’s still an impressive move to have. Is he broken? I don’t think so. But he is really well made. Idk about dark type Urshifu don’t have one yet.