Waxxed vs. unwaxxed laces?

I'm just getting some new ones, and while I've read a couple posts on this, I can't decide what to get. I'm not sure what I'm using right now, but I don't know what will be better between them. My skates are slightly oversized, so the better option may be waxxed laces, or so I've heard.

What do you think of waxxed vs. unwaxxed laces? What does each one do differently than the other?

Thank you!