You're misled if you buy a X570 Gaming Plus because of the chipset fan. It's been shown to heat up at the power delivery (not chipset) even at stock with R9 3900X , so if you are looking at 12 or 16 cores forget this board and move up the product stack. For 8 cores it's fine, but you really have to reconsider why you are getting it over a ~$130 B450
Pro Carbon which has Intel LAN , WIFI+BT, and ALC1220 audio with TOSLINK.
MSI has a few promotions going on right now that makes their Ace board much more affordable if you want to go with MSI and are buying 12 core. I'd go no lower than the Pro Carbon for 12 core really. If you go with the Pro Carbon & 12 cores I'd make sure to cool it well as MSI R&D decided to cover the power delivery in plastic which largely negates the power delivery improvement from Gaming Plus to ~$250 Pro Carbon.
Nobody has shown what Phantom Gaming 4 has under the heatsink. Anandtech lists UP1962S or something from UPI, but that's a driver and not an actual power mosfet. Anyway avoid this like the plague. Asrock's presentations show it as a budget level board. For 8 cores I'd be looking at the $200 Steel Legend and for 12 cores with PBO I'd either make sure to cool the board or to get the Taichi (which in terms of price/performance is a bit lacking this generation unless you plan on 3x M.2).
Gigabyte's Gaming X is pointless if you're futureproofing as it's missing USB 3.1 , uses Realtek LAN, and the audio is substantially
worse with ALC887. There's a massive step up from Gaming X to Aorus Elite, which is the cheapest board on Siliconlottery's QVL list currently and upgrades audio + LAN + power delivery as well as the heatsinking. It also puts M.2 above the GPU if you're OCD about that. If you intend to use your board for a long time the premium of $30 is near negligible spread out over 3+ years.
The X570-P is in a odd place as well. For a mere $20 more you can buy the TUF Gaming board which has 4 more powerstages , TOSLink for the audio (same ALC120
0 codec), and USB-C at the rear panel for $190 instead of $170. Realtek L8200A LAN may be a dealbreaker for some people as it's proprietary to ASUS which is a pain for any non-Windows OS as well as for longterm driver support. If you want an Intel LAN that will be well supported in the future, then the lowest board in ASUS' stack is the Prime X570 Pro for $250...