The GameSir X2 Pro builds on the X2 in ways the X3 didn't while also lacking features introduced on the X3.
DESIGNED FOR XBOX / ANDROID: GameSir X2 Pro Android controller is officially licensed by Xbox and is compatible with Android phones running Android
GameSir X2 Pro Mobile Gaming Controller for Android Support Xbox Cloud Gaming, Stadia, Luna, Android Controller with Mappable Back Buttons, Detachable
Gamesir X2 Pro Review - Their Best Game Controller Add-on and YET
The Best Telescoping Portable Gaming Controller - Gamesir X2 Pro
GameSir-X2 Pro-Xbox (Android) gaming controller review - like carrying around an Xbox Series X - The Gadgeteer
GameSir X2 Pro Review - IGN
GameSir X2 Pro Mobile Gaming Controller for Android
GameSir X2 Pro Review: Xbox for Android - One Chilled Gamer
Gamesir X2 Pro Review - Their Best Game Controller Add-on and YET
GameSir-X2 Pro-Xbox (Android) gaming controller review - like carrying around an Xbox Series X - The Gadgeteer
GameSir X2 Pro-Xbox Mobile Gaming Controller White
GameSir X2 Pro hands-on: The biggest problem with GameSir's controllers is finally fixed
GameSir X3 Type-C Mobile Game Controller for Android, xbox game cloud apk