The Red Oak Tennessee Cured is 100% VG and the Johnson Creek Tennessee Cured has pg. They both taste pretty much the same. The Johnson Creek TC tastes a little stronger and has a little more TH (because of the pg). The Red Oak kind will make more vapor but taste a little less strong and not hit quite as hard (because of the vg). The difference between the two tastewise is hardly noticable (kinda like the difference between a Marlboro Light and a Marlboro Ultra Light) but there is a BIG difference in vapor production.
I have noticed a flavor change when I've used different cartomizers though. Both of them (JCTC and ROTC) taste stronger when I used horizontal coil, 2.0 ohm, Boge cartomizers compared to the vertical coil, 2.6 ohm, Kanger cartos. I will only buy the Boge now because the taste is so much better. I've never used a dual coil or a clear one so I can't answer that.
If you want more flavor and good TH and ok vapor, get the JCTC. If you want ok flavor, ok TH and tons of vapor, get the ROTC. Or, what I do is use the ROTC in a one carto on my regular pv and keep one carto with the JCTC on my passthrough. That way I get tons of vapor from both. Have fun.