I prefer 70D build, plus bit rate goes up to 90 mbs, Bit rate for T6S goes only to 28 mbs, which makes it a very weak codec in post compared to the 70D.
In fact as far as bit rate is downgrade from T5i, T4i, or any other rebel.
However with ML bit rate can be increased, THERE IS ONE very important point where the T6s could be better if is real, is that has not Moire and aliasing.
For me that is Huge since Fabrics and textures are my main target as far as video goes.
I have overcome that problem with the T5i and T4i, using the Mosaic engineering filter VAF. But better not to have that problem to start with.
Because it does not work well at 720 only works well at 1080, and as all you know MLV can go to 720 max for clips longer than a few seconds.
Not to mention that 60P is only possible at 720 .