Yeah i'm comparing Intels 14+(?) 8 core to the 14++ 10 core, just not sure how they will half the base clock TDP, while increase core count.
While AMD aren't providing the best silicon to the desktop chips, the desktop chips are still great for what they are. 12 core chips using give or take the same power as the competitions 8 core chips? Can't be too unhappy at that surely. Well you can, but you can't please some people I guess. Calling AMD's actions the same as Intel's is a loooooooong stretch. I wouldn't expect Intel to provide their best silicon to desktop platforms either. They operate in very different ways though. AMD can pick and choose what silicon goes to what platform. Intel makes different chips for each platform so don't have that luxury. They would no doubt do the exact same thing though, that makes business sense.
As you say, pick a processor based on what you need and your budget. For now 95% of cases will incorporate an AMD processor. It just makes sense to go that way. I can't see it changing anytime soon unless Intel starts selling chips below cost just to get some sales.
3900X at the top end sits price wise between the 9900K and the 9900KS. Each level below that gets better and better value if going the AMD path.