I actually have both systems, two Maui 5's and a double Nano 300 system.
For home, if you only plan to get one Maui 5, I would suggest the Nano 300 instead, because you can still run stereo with just one unit, by separating the top speakers and hooking up correctly. You will need the optional extension package to do this.
Arrangers, and particularly Yamaha arrangers, are designed to be played and heard in stereo.
Hope this helps!
And welcome to the forum!