Much better sound and no connection / sync issues.

If I use the speaker to stream Spotify playlists over Wifi it will regularly just stop playing; skip to a new song or lose connection

The Jongo has the advantage of having an internal battery, but its connection to WiFi and its stereo setup have always been pretty flakey, and its app isn't nearly as nice as Yamaha's

One flaw, sometimes the connection fails and the quality of music is compromised.