Baby Carrier - Ergobaby 360 or Ergobaby Omni 360

Hi all! I need some feedback on the Ergo carriers. Which is better? Ergobaby 360 (Cotton) OR Ergobaby Omni 360 (Cool Air Mesh) I heard that cotton gets warm after a while. While the cool air mesh is hard and scratchy to the skin. Is it true? Which will you recommend? Thank you!