Short answer: the Ultimate Ears Boom 4, though neither ranks well in its class. It ranks #113 of 179 medium speakers by sound quality, rated 2.9/5, at $114.99. The Skullcandy Terrain ranks #169, rated 2.1/5, at $49.93, $65.06 cheaper, a saving that is not big enough to make up the sound-quality gap. Both are rated below 3.0/5 among the 179 medium speakers, and the EarFun Uboom L, ranked #2 at $49.79, is a better place to start if sound quality matters.
The Ultimate Ears Boom 4 is the better-sounding choice. A tough waterproof speaker that floats, with USB-C charging, app EQ and pairing with other UE speakers. It has an adjustable EQ, which the Skullcandy Terrain lacks. It plays in stereo from a single unit, unlike the Skullcandy Terrain. The catch: Not much improvement over the old ones.
The Skullcandy Terrain is the lighter choice. A waterproof speaker with a wrist wrap for carrying and pairing with other Skullcandy speakers. At 1 lbs (458 g) it weighs noticeably less than the Ultimate Ears Boom 4 at 1.4 lbs (620 g). The tradeoff: No bass, very rolled off treble.
Buy the Ultimate Ears Boom 4. It is rated higher for sound quality, and saving $65.06 with the Skullcandy Terrain does not make up for the sound-quality gap.
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Specifications Side By Side
| Ultimate Ears Boom 4 | Skullcandy Terrain | |
|---|---|---|
| Price | $114.99 | $49.93 |
| Ranked | #113 of 179 in Medium Size Portable Bluetooth Speakers | #169 of 179 in Medium Size Portable Bluetooth Speakers |
| App | Yes | Yes |
| Battery Life | 15 hours (Manufacturer specified) | 14 hours (Manufacturer specified) |
| IP Rating | IP67 | IPX7 |
| Power Input | USB-C | USB-C |
| Stereo | Yes | No |
| Omnidirectional | No | No |
| Weight | 1.4 lbs (620 g) | 1 lbs (458 g) |
| Bluetooth | Yes | Yes |
| Bluetooth Version | 5.1 | 5.3 |
| Dimensions | 7.2” x 2.9” x 2.9” (184 x 73 x 73 mm) | 6.3” x 3.1” x 3.1” (160 x 79 x 79 mm) |
| Drivers | 2x 1.57” (40mm) active drivers + 2x 1.81” x 2.57” (46.1 x 65.2mm) passive radiators | 2x 48mm drivers + passive radiators |
| TWS | Yes | Yes |
| EQ | Yes (via app) | No |
| Built-in Microphone | No | No |
| Power Bank | No | - |
| Aux Input | No | No |
| Maximum SPL | 85dBC (Manufacturer specified) | 90dB SPL (Manufacturer specified) |
| Digital Aux Input | No | No |
| Bluetooth Codecs | SBC | SBC |
| Strap | Yes (built-in loop) | Yes (wrist strap) |
| Party Mode | - | Yes (SKDY Multi-Link, up to 99 speakers) |
| Amplifier Power | - | 2 x 6W |
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