I am searching which of both motherboards is better for gaming.
The comparison should be based on price/performance. Thanks in advance.
Well the Z87 Pro has the older, but still feature rich Z87 chipset. That is not necessarily a downgrade.
Also, it has Wireless N built in, and more SATA ports, meaning you can have more hard drives for games etc.
It is also a good overclocker, and has a better VRM cooler, meaning the power delivery will stay cooler during heavy gaming loads.
It has slightly better onboard audio, ALC1150 vs ALC898
The Z97 A has M.2 SSD support, but they still cost a fair bit, and also SATA express, which is not very common yet on SSDs.