Grove vs Mylar. How much better are actual Grove Bags

Has anyone actually tried both? Almost every review I see is from people switching from glass to Grove or Mylar. I've never personally tried Grove bags but have used a few cheap Mylar bags and love them compared to glass.
$3 for 100 Mylar bags compared to $3 each for actual Grove bags are they really worth it?

Grove bags let the contents "breathe", mylar bags do not "breathe" unless they are specifically designed to. If they are, and you like them, use them!