Sound:
Here the JBL is clear to me forward. He plays just balanced, clearer and with more bass. The Mobi has simply direct comparison too much treble. From the volume, both receive nothing.
Battery:
The Mobi 2 to play up to 10 hours and the JBL up to 5h. I own a HTC One and both have let them play there at full volume the same songs.
The Mobi made via Bluetooth after about 200min limp and the JBL unfortunately after 75-80min.
On a Samsung smartphone, it will probably be me few more minutes, because the max. Volume fails there low.
Optics and handling:
The JBL is processed high and weighs a little more.
Coupling via Bluetooth also works better when JBL. The cable is twice as long as the Mobi 2 while JBL roughly.
Conclusion:
Who can do without a little bass, should the Mobi 2 buy, as it costs only half.
Who the battery is not too important for the sound even more, should pick up the JBL.