Nhadala

To be completely honest, strength is better than dexterity in every way. Strength weapons are hands down superior to dex weapons stat-wise, so if that's all you care about, build strength. There are also just a lot more strength weapons in general. Dex weapons tend to have the cooler movesets though, and they still work fine. Basically, if you want to use whips, rapiers, and stuff like that go dex. If you want stats, straight swords, clubs, greatswords, hammers, axes... go strength.

Your attack stat (Str or Dex) should be your highest stat by far. I honestly wouldn't level health too much. Most bosses will still one shot you anyway, so it's generally not worth it. That being said, don't ignore it completely, but build it up slowly. Don't focus on it. Your attack stat and your endurance are far more important for a melee build.

Yeeeea, keep in mind I was palying Bloodborne the msot recently... Health is better in it due to the Rally mechanic that allows you to regain HP from attacking enemies.