The only thing that crosshair is good for is letting you know when you're more accurate (which is a good) but after you get a hang of movement it's not really needed.
Crosshair is really only personal preference, I personally find it a bit distracting so I just use a static crosshair. \o/ I do use that one though when I'm trying to train movement/stutter stepping as I find it helps
TIP: Don't hate on someones crosshair lel