As with most any game, PC is the preferred platform to play. The advantage of playing this game in particular on PC is the quick and easy movement of items to and from the inventory. Additionally, the gameplay is more fluid and the game runs smoother.
PC differs from Xbox and Mobile in that it features proximity chat. You can hear other players in game chat only within a certain range. When you encounter other players though it normally results in screaming. Sometimes if you can try to reason with the other player you encounter and go your separate ways. This normally results after both players miss every shot and are completely humiliated, so they just pretend it never happened. Additionally, the PC version of the game contains a few different maps.
The Xbox version of the game is actually considered a "Game Preview", which basically just means it isn't in its completed stage yet. Moving items to and from the inventory is a little more timely. The game is also a little sluggish, occasionally crashes, and contains no proximity chat. It also only has one map. The developers have been working a lot on improvements, updates, and fixes.
The mobile version is tricky to play. The touchscreen interface makes a game like PUBG difficult because its hard to make quick and sudden movements. The controls are also on the screen, cramming everything together. If you can get the hang of the difference in controls, it's very easy to become better at this game than everyone else because of it being tricky. Not to mention, whereas on PC and Xbox the performances of each platform are within a relative range, on mobile there are so many different smart phones that game performance will vary greatly from device-to-device.
