These two keyboards are the same size, and I'm hoping that I can sneak one as a carry-on even though they exceed baggage requirements in length, but they're only 3.5 inches thick.

The Roland Go Piano is 61 keys and operates on batteries. These are big pluses for me. I can see me practicing with headphones at the airport.

The Yamaha MX-49 has only 49 keys, but it has so many cool sounds that I thought I could use it at home as a sound bank.

I already own a PSR-S970. The MX-49 has 1000 tones from the Motif. Is there going to be a lot of sounds on the MX-49 that I would enjoy it at home?

The MX-49 is $200 more even though I saw an open box one for $100 more than the Roland Go piano.

I'm assuming they both have kind of crappy synth-like keys. You got to make sacrifices when you're on the go.