Ideally, you should use the 2.4GHz band to connect devices for low bandwidth activities like browsing the Internet. On the other hand, 5GHz is the best suited for high-bandwidth devices or activities like gaming and streaming HDTV.
Is 5GHz WiFi better?
In summary, 5 GHz is faster and provides a more reliable connection. It's the newer technology, and it's tempting to use 5 GHz all the time and write off 2.4 GHz Wi-Fi. But 5 GHz Wi-Fi's shorter radio waves mean it can cover less distance and isn't at good as penetrating through solid objects as 2.4 GHz Wi-Fi is.
Which frequency band is best?
In the 2.4 GHz band, the lower frequencies that are transmitted here can more easily penetrate solid objects, meaning the signal can be better carried out throughout your home. WiFi network speed— The higher frequency 5 GHz band makes up for its shorter range with much faster WiFi speeds than the 2.4 GHz band.