I've owned the Thorens TD-316 and own the HW-19 Mk. III.
Clean your main bearing and platter spindle thoroughly and add Tufoil to both. The difference will be
momentous on the Thorens and
slight on the VPI. The VPI starts life out with higher quality bearings (better tolerence, likely). Once you do that the differences in s/n or 'quietness' should be a lot slimmer. You can decide which to toss then

However, my VPI sits idle for the past year - capably replaced by a JVC QL-F6 bought used on ebay for $100.00. It has lots of Matsushita parts in it...as befits a company wholly owned by them. Matsushita also makes the aforementioned Technics deck.