Is it easier to tune an instrument to the keyboard or keyboard to the instrument? It seems as though it would be easier to tune the guitar with the tuner and then tune the keyboard to the guitar.

What ever you find easier..
A guitar and tuner would be quicker.
Not only that, some Roland's tend to be tuned to 442Hz, and some prefer 440Hz (concert pitch)

DISCLAMER: so I've been told

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The Sonic Energy Authority - a sound investment

I've always tuned the guitar to the keyboard. To me that's te fastest and easiest way. Just really tune the low E on the guitar to the keys. then tune the rest of the strings to the low E.

Bob