I had the Evo 4G LTE for like 2 weeks before the SGSIII launched. Did NOT like the way the filesystem was laid out, and other stuff. I'm happy I switched to the SGSIII. I just swapped my wife over to a 16GB White SGSIII, as her Blackberry 9670 had a blown speaker. She's happy (albeit with a learning curve).
SGSIII is the best android out there at the moment on Sprint.