ArtFire is a community based handcraft site and BigCartel is a shopping cart for indie artist. So, one would think you would have more traffic on ArtFire. I have 31 items listed on ArtFire and have had 900 views in three weeks. BigCartel has 25 items listed and has had 1400 views.
Chunky yellow necklace
Also, tonight I made my first sale on Big Cartel. I believe the customer found me via my Facebook page. I don't promote my ArtFire shop on Facebook, just my Etsy and BigCartel shop.
So, my experiment is over. Tomorrow I will deactive my ArtFire shop and add more to BigCartel. The ArtFire owner is very friendly and the forums are helpful. It's easy to set up shop there too. I find that BigCartel visually looks better if you buy a theme to install or know how to code.
Thought I would share for those considering one of the platforms.