Like the PC version of xemu, X1 Box does not include system files due to legal reasons. You must provide: Xbox Emulation on Android is Here! (Sort of)
For years, Xbox emulation on Android was virtually non-existent or restricted to niche apps with severe limitations. xemu changed the landscape by offering a dedicated solution. However, "best" comes with caveats: xemu xbox emulator android best
Xbox emulation is notoriously resource-heavy. To get playable frame rates, you need a flagship-tier device. Like the PC version of xemu, X1 Box
If you are looking to play original Xbox games on Android today, the most mature solution is Like the PC version of xemu
Do not use extracted Redump ISOs (they are 1GB folders). Convert your games to XISO (dot iso) . Xemu loads compressed XISO files 40% faster than loose files.