Hello! I have both. If you play live for small groups and like 61 notes, the 800 cannot be beat (portability and on-board speakers). I love my 2x in my home, safe and sound (beautiful board) and use it as my studio board. You're probably aware they are both the same OS, but the 2x has many extras and is a player's dream machine.
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Yamaha 920 / Yamaha DGX-670 / Maui 5 Go (2) / Senn e935 / Sony C80 / Tascam DP24sd / ATEM Mini Pro switcher (studio)