No difference in the points awarded, JP. I generally use an in-line review if I spot at least three or four things I want to comment on as I read the post. If I don't find them, I revert to a regular review.
My own preferences are evenly divided between the two types of reviews. If someone has a point to make, or want to add a comment on what I've posted in-line, then I say go right ahead. A regular review will tell me right away if the person has read the post if it refers to things in the post. If it is filled with "filler words" simply to get to the required 50 words, then that's a different kettle of fish.
I generally don't invoke the X-Line review unless I'm reading an in-line review of my own works. Then, you are able to view every comment without having to click the blue highlights.
Bill