I read on the internet a lot about both devices and now had the opportunity to test both devices in direct comparison a few days extensively. The size difference is only minimal, the Logitech is clearly more difficult. The build quality is really good on both devices, which should be at this price so. The Logitech box can with a defective battery will continue to operate more than 220 volts, which is not possible with Bose. At Logitech, the battery can be exchanged via a flap under the instrument itself. Although is a special battery, which can be ordered only in a few months, according to Logitech, but is readily available through an electronic shipped as third-party product. Square area is still plenty down there. By the way only with a plug connected. Since the UE Boombox is powered by a power supply with 12 Volt output, it is with a standard 12 volt cable in the car, or as in our motorhome available. Now to the most important point, the sound. I am an absolute Hififreak and must say clearly here that it is of course not to Hifi-equipment with corresponding sound on both devices. Right in the first comparison is the Logitech emerged as very clear sound winner. It acts much adult with much more bass and treble. Both, however, is really not an exaggeration or annoying. The centers actually missing some of its assertiveness. But what stands out only for certain titles and in direct comparison. Even at high levels there are decent bass without distortion. So clearly a great Partybox for young and old with fun factor, which sounds really grown up. By contrast, the Bose SoundLink acts like a little mini box, which can not really enforce. Simply does not fill the space. The sound is very clear but not bad! In classical music and singing in medium volume it plays out its strengths. The centers come to medium volume to full advantage. The low frequencies are absolutely available at medium volume. Nothing annoying in the long run really. But at slightly higher volume levels of low frequencies is controlled completely down, which makes then no fun anymore. In direct comparison but it also lacks the high range. You can not hear both speakers in direct comparison, so should both make life fun, because what comes out of such small boxes out, is quite amazing. But I remain clearly at the Logitech because it's much more fun and can be used for a party sometimes. The Bluetooth connection works the way excellently for both devices. At least with the iPhone 5 and IPad4. I hope I can one or the other to make the decision so simple.