ASUS PRIME Z370-A vs ASRock Z370 Extreme4 motherboard

Asus Prime Z370-A and ASRock Z370 Extreme4 are closely priced motherboards whose prices hover around $180. Many people can get confused between the two and need to know which will perform best. So, I have done the research and have put the similarities, differences and conclusion for both the motherboards which will help you to select your desired motherboard for your PC build.  

VRM

8+2 Power phase design
Theoretically fine overclocking

Memory Overclocking

Supports up to 3866Mhz OC memory

PCI Slots

4x PCI-Ex 1 slots
Doesn't supports Quad Nvidia SLI and Quad AMD CrossfireX

Onboard Features

1x MemOK and 1x PWR_SW buttons
No USB 3.1 Gen 1 Type C header

I/O Ports

1x DP Port
Only 2x USB 3.1 Gen 1 ports

Storage

1x M.2 Support both SATA and PCI-E modes but 1x M.2 supports PCI-E mode only
1x M.2 slot comes with heatsink

Fan Headers

1x 5pin EXT_FAN connector

BIOS

Asus Bios(Easy interface and lots of functions)

VRM

12+1 Power phase design
Theoretically much better overclocking

Memory Overclocking

Supports up to 4333Mhz OC memory

PCI Slots

3x PCI-Ex 1 slots
Supports Quad Nvidia SLI and Quad AMD CrossfireX

Onboard Features

No onboard troubleshooting buttons
1x USB 3.1 Gen 1 Type C header

I/O Ports

1x VGA Port
4x USB 3.1 Gen 1 ports

Storage

Both the M.2 slots support SATA and PCI-E modes
No heatsink for any M.2 slot

Fan Headers

No extension fan header

BIOS

ASRock Bios(Just Fine)

It has much better bios and has easy interface both in Bios and AI suite software to overclock CPU and Memory

Comes with 1x DP port for connecting to a monitor which is the best interface till now

1 additional PCI-Ex 1 slot can be used for various expansion cards

Onboard troubleshooting is easier with Power switch button and MemOK button

Heatsink on the second M.2 slot will help achieve lower temperature on the NVME SSD

Has more Power phases which means better stability in overclocking

It has a onboard USB 3.1 Type C header which is very beneficial in many cases

Both of it's M.2 sockets support SATA as well as PCI-E modes which means better compatibility

It supports Quad SLI and Quad CrossfireX. Although, it's not a big advantage in general

It has 1x DVI port which can be used to connect to a monitor not having having DP or HDMI ports

It has 2 more USB 3.1 ports over Asus Prime Z370-A at its I/O

It supports highly overclockable memories