Came across this sales ranking on ebay - not sure how accurate (when updated, etc.) but interesting none-the-less
https://www.ebay.com/t/Pro-Audio-Synthesizers/38071/bn_2313927
Always interested in what other people are buying (esp. non forum people - perhaps we get a biased view on here). At the time I checked he Korg Volca FM was number 1. Very interesting if so.