I didn't vote, because to me it doesn't matter - I don't print on them! I slide the magnet sheet into the back of a page protector, print my signs on regular paper, and slide a new one in in front of the magnet every day - One magnet sheet - seven signs! SO MUCH less expensive!
Even for small magnets, I tend to print on photo paper, cut them out, and use my xyron to glue them to the magnet sheet after I'm sure they're exactly the way I want them.