I saw these side by side yesterday. They were playing store style video rather than OTA, which would have made comparisons much more meaningful.
E320VA is cheaper and I expect older. It is fluorescent backlight and thicker. It has rear-firing speakers at the bottom.
E321VL is edge LED backlit and thinner. The E321VL has a hump at the bottom in profile. That seemed to be a downside for a wall mount tilted down. That hump seemed to be the rear-firing speakers. Side by side the E321VL audio was a little ahead of the E320VA audio. That seems to me to indicae that the E321VL has a faster processor.
To my non-expert eye, the E320VA picture looked at least as good. I was leaning toward the E320VA for wall mounting, since the forward firing speakers seemed to make more sense.