There's two kinds of parsley (not including coriander/cilantro which is its own headache):
The flat-leaf stuff that has a mild flavour but no texture and is better replaced with coriander if you're not one of the mutants who tastes soap when eating coriander.
The frizzy-leaf stuff that has a stronger flavour and a texture, but the flavour is bitter and the texture is kind of like eating hair.