I'm training in a Sling out of KTOA. No RV-12s available for flight training here in Southern Taxyafornia. Building an RV-12. Can't compare the two as I am not yet experienced enough to do so. BUT - the Sling has a tail dragger option - I saw it with my own two eyes! Not for me but I think that there are a few of you out here who would opt for the RV-12 tail dragger if there were such an airplane. Van's?
On a lighter note, a few years ago, I sent a note to Kitplanes Magazine suggesting that they run a side by side evaluation. Still hope to see that happen some day as these two aircraft have many outstanding but different qualities.