5800x3d. Upgraded a little while ago and love it

What is 'best' for you depends almost entirely on your use case. If gaming is the primary use case then the 5800X3d is all you need to know for "best CPU on AM4". The only reason to consider a 5950X or 5900X is if you have heavily threaded content creation or engineering simulation useage in time constrained work scenarios. But gaming performance won't be up to the standards of the 5800X3d. A 5800X is cheaper than any of those three and decent enough all-around as it performs well in content creation and engineering simulation where the X3d can't deliver. Although, an even cheaper 5700X can be pretty much just as good as a 5800X once tweaked with PBO and optimized CO curves. For budget cases, 5600X and 5600 work the same and have good enough gaming performance, although much weaker in the heavily threaded tasking with 25% fewer cores & threads to work with. Complete platform performance payoff depends on chipset, though. If your current board is a 300 or 400 series chipset it won't enjoy PCIe gen 4 NVME or GPU that requires a 500 series chipset.