Any of the Garmin Zumo's are great for both. If you want XM, get the 665, if not, look at the model comparison for what's important to you and don't look back. Zumo's are the best for a motorcycle application.
I have a 665 and it has been rock solid.
Enjoy the Ride!
2013 RGU in Big Blue Pearl
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S&S Power Tune Duals w/V&H Slash Cuts, TTS Mastertune, Daymaker Headlights, Hawg Wired RS 400 amps, J&M Rokker speakers, AN Big Sucker, Corbin Dual Touring Saddle, Madstad, Progressive Monotubes, JRI Shocks, All LED lights, & several Chrome Goodies.