Picking the best value productivity CPU has become quite the challenge due to the numerous choices AMD has put forth, all 8-core/16-threads or better. The Ryzen 7 2700X is hard to beat when it comes to productivity workloads for the price. It can be had for $230 and that makes paying almost $100 more for the 3700X a little tricky. For productivity the 3700X is 15 to 20% faster, so many won't want to pay ~35% more for the bump.
Therefore, if you want the best value for work get the 2700X, assuming you can get it for a hefty discount when compared to the 3700X. But if 2nd-gen Ryzen pricing isn’t great in your region, then get yourself the excellent 3700X.
If you need a bit more oomph, there’s the Ryzen 9 3900X and if you need all you can get without going extreme, get the 3950X. You’re paying a 7% premium per core with the 3900X over the 3700X, but you’re also getting 4 more of them. Then the top of the line Ryzen 9 3950X comes in at a 13% premium per core.