I travel for business. The S9 and humidifier fit just fine in my roll-aboard. I've never seen an A10 but it appears to be a bit smaller since the humidifier is integrated.
The A10 seems to have an integrated GSM data modem. I'm not really wild about my DME having access to my machine once the insurance compliance period is over. I had a bad experience with my last DME changing settings on me. I read them the riot act and handed them their GSM modem back. I guess I can find a menu setting on the A10 to disable it.
So... This seems to be a decision of going with what is known to work flawlessly for me versus going with the latest & greatest. I'd welcome some opinions since I'm having a tough time making a decision.