My first full gaming PC build in about 5 years; I had to indulge in the rainbow barf culture. Also, I just reused my GPU from my previous build as it was a more recent upgrade.
I picked the ASRock X570 Taichi due to the excellent reviews of the X470 Taichi and I also loved the aesthetics. The price point wasn't bad either considering all the features it comes with. Initially the on-board fan is way too loud, but you can dial it back in the bios settings.
For the RGB lighting, I wanted to stick with the built-in ecosystem of the motherboard, in my case, ASRock Polychrome. This was probably a mistake as Polychrome is severely limited. All my components are technically compatible, but the only really synchronized effect I can achieve is the rainbow theme. There is also only 1 ARGB header, which I used for the CPU cooler, so I bought regular RGB fans. Fortunately I was able to daisy chain all 9 fans to a single 12V RGB header.
My RAM is rated for 3600mhz, but I was worried I wouldn't get that speed out of the box with two kits installed. Fortunately I was wrong. It seems to run flawlessly just with XMP enabled. I also love the look.
Also, the Lian-Li PC-011 Dynamic is just as awesome as I'd hoped. Plenty of room in the front and the back and it just looks so premium; would definitely recommend.