Depends on what game, if you wanna play latest AAA with max graphic, use a PC, you can also use a laptop but be ware of heat. As for phone, not much said, card games are good like yu gi oh or hearthstone. Im an ex IT sales so yea i have some exp.
for pubg i prefer mobile because pubg is to heavy game which is only for mobiles if you run this at you wil face to much lag also there is not a good bulets connectivity in pc but in mobile just fire and down the enemy
PC: Best for heavy tasks, like gaming, video editing, and 3D rendering. Laptops: Portable, and great for on-the-go work or light gaming. Mobile devices: Ideal for social media, videos, emails, and general browsing. It's all about what you use it for.