Is it cheaper to sell on eBay or Mercari?

I'm curious about the costs associated with selling on eBay and Mercari. Could you explain which platform offers a more cost-effective option for sellers? Are there any fees to consider, such as listing fees or transaction fees, that would impact the final profit margin? Additionally, how do the shipping costs compare between the two platforms? And lastly, is there a significant difference in the potential reach and exposure of my listings on either platform?