I took the plunge. I decided to go with the Ryzen platform after all. Here's why.
1. Future proof - By investing in the x570 Asrock Motherboard I have the option to get a Thunderbolt card in the future. I also have the option to upgrade to 128GB ram if I feel it becomes necessary. Also, this chipset is still new and future updates might only improve performance in the future. It also seems that whatever CPU I choose I can always upgrade to a better one in the future so I'll likely go with the Ryzen 7 3700x for now and maybe upgrade to a 3900x or even a Threadripper in the future.
2. Bang for buck. a 3700x with MOBO, case, ram, SSD's etc... ends up being roughly the same cost as an Intel i9 9900k, which does outperform the 3700x, except when it comes to multitasking and since the 3700x still comes admirably close to 9900k performance and when it comes to multitasking I find that I do that a lot even when I composing music so I think the 3700x will balance my workload a bit better overall. I also do a "little" bit of Video editing and that's another area where Ryzen comes ahead. With the 9900k I have no other upgrade path (at least not a real affordable one) but with Ryzen I do so even if 9900k is better with samples I can remedy that with a new CPU like a 3900x or a new Threadripper (when it comes out). However, my biggest bottlenecks are not CPU but rather lack of SSD's and memory so as I put my system together I doubt I'll notice any lack of CPU performance given I've focused on also upgrading Ram and Upgrading to SSD's.
Things I don't like about my upgrade:
1. There are always trade offs and I still don't like having a fan on my chipset but after looking at the video Evildragon shared I might decide, if it bothers me enough, do do a mod of my own replacing the fan (at my own risk) with an aftermarket heatsink.
2. I wish there were Integrated Graphics with the Ryzen since I don't particularly have a need for better graphics but my old system has a Radeon HD 6950 so I'll just use that and my old system can go back to using the Intel Integrated graphics (problem solved).
3. I'm not fond of the fact that X570 boards are currently higher priced than competing Z390 boards. If they were priced more competitively then making this decision would have been a lot easier (almost a no brainer). It still is a no brainer for people satisfied with what B450 and X470 have to offer.
4. Currently options are limited to Asrock for people that would like to have Thunderbolt. That will certainly change in the future and if rumors are true of incorporating Thunderbolt specs into future USB platforms then it becomes less of an issue.
So as you can see, in it's current form there are still trade offs to consider when moving from an Intel ecosystem but no matter how much money you spend on either platform that seems to be the case. I think I've carefully weighed the decisions and found what's best for me. At some point indecision was becoming my worst enemy and I really need to get back to work so there really was no wrong decision other than the need to just make a decision. Truth be told, flipping a coin helped me finalize my decision