Short answer: the Bose SoundLink Max for portability and features, the Teufel Rockster for maximum output. The Rockster is the loudest battery powered speaker around, with deeper bass than the Soundboks 2 or 3, but it is extremely heavy, not easy to carry, not stereo and only available in Europe. The Bose is IP67 rated and has a USB-C port that doubles as a charger, though it distorts above 80% volume. The Teufel Rockster is discontinued; its replacement is the Teufel Rockster 2.

Buy the Bose SoundLink Max for a large speaker, or the Teufel Rockster for a large party speaker instead.
If battery life is a priority, the Teufel Rockster is rated for 30 hours versus 20 hours for the Bose SoundLink Max.
If water resistance matters to you, the Bose SoundLink Max at IP67 (brief submersion) holds up far better than the Teufel Rockster at no water resistance.
Want more options? Browse the full Portable Bluetooth rankings.
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Specifications Side By Side
| Bose SoundLink Max | Teufel Rockster | |
|---|---|---|
| Price | $399.00 | €950 Discontinued |
| Ranked | #17 of 120 in Large Size Portable Bluetooth Speakers | #9 of 13 in Large Party Size Portable Bluetooth Speakers |
| App | Yes | No |
| Aux Input | Yes | Yes |
| Aux Latency | 33ms | - |
| Bass Extension (-10dB) | 48Hz | - |
| Battery Life | 20 hours (Manufacturer specified) | 30 hours (Manufacturer specified) |
| Built-in Microphone | No | No |
| IP Rating | IP67 | None |
| Bluetooth Latency | 116ms | - |
| Power Bank | Yes (USB-C) | Yes |
| Power Input | USB-C | AC Power cord |
| Stereo | Partially (1 tweeter) | Yes |
| Omnidirectional | No | No |
| Weight | 4.9 lbs (2.2 kg) | 68.3 lbs (31 kg) |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC | aptX, SBC |
| EQ | No | Yes |
| Party Mode | No | Yes (Party Link, up to 100 speakers) |
| TWS | Yes | Yes |
| Bluetooth Version | 5.3 | 4.0 |
| Dimensions | 10.4” x 4.7” x 4.1” (264.7 x 120.1 x 104.9 mm) | 23.1” x 30.2” x 17.8” (588 x 768 x 451 mm) |
| Drivers | 2x 2.5” (63.5mm) midrange drivers + 1x 0.79” (20mm) tweeter | 2-way: 1x 15” (380mm) woofer, 1x 1” horn-loaded tweeter |
| Digital Aux Input | No | No |
| Strap | No | No |
| Guitar Input | - | Yes |
| Microphone Input | - | Yes |
| XLR Input | - | Yes |
| USB Playback | - | Yes |
| Wi-Fi | - | No |
| Amplifier Power | - | 450W |
| Maximum SPL | - | 115dB (Manufacturer specified) |
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