Deciding on a motor you haven't ridden, and that you can hardly test ride anywhere, is always tough, you read so many different opinions. What I can tell you is that even Bosch Gen3 didn't feel right to me in terms of "naturalness". Only the Gen4 feels okay to me, but just in terms of how natural and agile it feels when pedaling, I would still prefer a Brose or Shimano EP8(000) over it.
You can also get a Dengfu E04 with E06 rear triangle to make a Shimano EP8000 fatbike