I have an Epson V700 and a Plustek Opticfilm 120. I have scanned quite a few images with each. I don't suppose I am a great expert in scanning, certainly the results bear ample witness to that! But I have learned a little bit along the way.
When I compare the results of scanning the same slide/neg with each, I can't help thinking the Epson is better - in the sense it provides an image I find more attractive. The Plustek can be too sharp, giving a result that brings out too much grain of a neg. I appreciate you can smooth things down, but you don't have to with the Epson. If you have a ISO400 grainy neg film, I rather think the Epson will give a better account of it than the Plustek.
I am not sure the Plustek, at 3 times the price, gives an image that is 3 times better.
It seems to be the fashionable thing to say that the Epson won't scan 35mm well, but unless you are pixel-peeping, I find it does. it also scans batches better.
As with everything, it comes down to what the individual prefers. The OP did a great test - it's up to him, as with all of us, which he prefers.
rjstep3