Short answer: the Miatone Boompro. It ranks #16 of 179 medium speakers by sound quality, rated 4.2/5, at $35.99; the Bose Soundlink Flex ranks #38, rated 3.8/5, and costs $79.99, so there is little reason to consider the other one.
The Miatone Boompro is the better-sounding, longer-running choice. A cheap waterproof speaker with very well balanced sound, even at full volume, and a 16 hour battery. It is rated for 16 hours of battery against 12 for the Bose Soundlink Flex. The catch: Slightly less bass extension than higher ranked speakers.
The case for the Bose Soundlink Flex: A small, rugged waterproof speaker that survives drops and floats, with a warm, bass forward sound for casual outdoor use. The catch: Not stereo.
Buy the Miatone Boompro. It is rated higher for sound quality than the Bose Soundlink Flex and costs less, so only choose the other one for a particular feature it does better.
Want more options? Browse the full Portable Bluetooth rankings.
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Specifications Side By Side
| Miatone Boompro | Bose Soundlink Flex | |
|---|---|---|
| Price | $35.99 | $79.99 |
| Ranked | #16 of 179 in Medium Size Portable Bluetooth Speakers | #38 of 179 in Medium Size Portable Bluetooth Speakers |
| App | No | Yes |
| Aux Input | No | No |
| Battery Life | 16 hours (Manufacturer specified) | 12 hours (Manufacturer specified) |
| EQ | No | No |
| IP Rating | IPX7 | IP67 |
| Power Bank | No | - |
| Power Input | USB-C | USB-C |
| Stereo | No | No |
| Omnidirectional | No | No |
| TWS | Yes | Yes |
| Weight | 1.1 lbs (500 g) | 1.3 lbs (589 g) |
| Drivers | Dual drivers | 1x 60mm full-range driver + 2x passive radiators |
| Digital Aux Input | No | No |
| Bluetooth | Yes | Yes |
| Bluetooth Codecs | SBC (inferred; additional codecs unverified) | SBC |
| Lights | Yes | - |
| Dimensions | 7.3”H x 2.8”W x 2.8”D (185 x 71 x 71 mm) | 7.9” x 3.5” x 2” (201 x 90 x 52 mm) |
| Amplifier Power | 36W | - |
| Bluetooth Version | 5.3 | 4.2 |
| Bass Extension (-10dB) | - | 56Hz |
| Built-in Microphone | - | Yes |
| Bluetooth Latency | - | 33ms |
| Maximum SPL | - | 96dB (measured by Alan Ross Reviews) |
| Party Mode | - | Yes (Bose Party mode) |
| Strap | - | Yes (built-in loop) |
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