No experience with the Valeton, but I bought the TC as a potential backup to my early MIJ Octaver. It wasn’t anywhere close. The Nether was very dark and muddy; nothing like my OC-2.
That said, I’ve tried almost all the boutique clones & alternatives to the OC-2 (COG, 3Leaf, Broughton, etc) and while some get very close I’ve always returned to my OC-2. I really wish Boss would consider a Waza OC-2.