Phraseology highlights selected words and is cumulative. Writer Pro dims the 'unselected' words and (I'm assuming) doesn't let you stack word classes.

I prefer Writer Pro's execution. I can see it as something that will actually speed my workflow up. Phraseology doesn't look like it will make things any faster for me.

It's not just about the nature of the feature, it's about how it affects my end-product as well.

Edit: double checked Phraseology and mixed it up with a Spanish-English app made by same dev team. Edited accordingly.