The main difference is CPU/GPU
MXIII G: Amlogic S812 Quad Core processor with the Octa Core ARM Mali-450 graphics engine
Beelink i68: Rockchip RK3368 processor with the Octa Core 64 bit Cortex A53 graphics engine
Both have
Android 5.1
2G / 8G
Wifi 2.4Ghz /5.8 Ghz
1000 Mbits RJ45 ethernet
Bluetooth 4.0
4K x 2K H.265 Decoding
XBMC / Kodi
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