I really love Mercari, it's quickly becoming one of my favorite places to sell Pokemon cards just because of how easy it is to list things and all of the useful tools that they have for sellers to help them reach more viewers.
I start my prices a little on the higher side to take advantage of the selling tools that will presently percentages off of your listing as you drop the price.
For visual effect this seems to draw people's attention more and there's easy ways to help promote your listings without paying additional fees like you would on Ebay.
Overall my experience so far has been really good and I'm hoping to keep listing even more stuff on here!