When comparing Bose SoundSport (SIE2) vs AKG K553 Pro, the Slant community recommends AKG K553 Pro for most people. In the question“What are the best headphones?” AKG K553 Pro is ranked 132nd while Bose SoundSport (SIE2) is ranked 157th. The most important reason people chose AKG K553 Pro is:
The K553 Pro's earpads feature pleather materials which feel supple on the skin. Inside, the quality foam should provide ample cushioning. The headband also features a pleather surface and has some padding, which should help ease the pressure off of your head.
Specs
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Pros

Pro Engineered for exercise
The SoundSport earpieces are designed to stay in when running or performing other intense activity.

Pro Choice of color (iOS only)
SoundSport earbuds with iOS controls are available in blue, green and orange. The Samsung Galaxy (Android) model comes only in green.

Pro No ambient sound isolation
Because these earbuds are intended for exercise, they let in outside sound so users can remain safe and alert.

Pro Hydrophobic housing
These earbuds are covered in hydrophobic cloth in order to keep sweat or rain out, while still letting sound pass through.
Pro Quite comfortable to wear
The K553 Pro's earpads feature pleather materials which feel supple on the skin. Inside, the quality foam should provide ample cushioning. The headband also features a pleather surface and has some padding, which should help ease the pressure off of your head.
Pro Produces clean and accurate yet versatile sound
The sound is clear and accurate, and it should be very easy for the listener to pick out the details in the music. The bass level is just right without sounding boomy or muddy. The mids sound natural and neutral so these frequencies do not jump out of the mix. The highs are slightly extended, but do not make the sound harsh in any way.
Pro Solid build quality and premium feel
These headphones have very good build quality. Solid plastic and durable-feeling plastic is used for most of the headphones' parts. The matte finish adds a softer and more premium feel to the plastic surfaces. The headband is made of metal so it can handle some flex without breaking.
Pro Great noise isolation qualities
The closed design helps to greatly minimize sound leakage from these headphones. People near you will not hear what you are listening to when using these headphones. Also, the pleather pads allow for a great seal which further helps to minimize sound isolation and block outside noise from interfering with your listening experience.
Cons

Con No ambient sound isolation
By design, these earbuds do not obstruct outside sound, making them inappropriate for use when isolation is desirable.
Con Earpads may be too small for some
While the ear pads are able to provide ample cushioning, they are quite thin. Large ears may come into contact with the driver housing. This can lead to some discomfort and annoyance, especially when wearing the headphones for long periods of time.
Con Long, non-detachable headphone cable
You may encounter some hassle when using these headphones due to the cable. While the length is quite good at around 3 meters, the cable can get in the way and can be quite difficult to organize. The cable is also non-detachable, so replacing it can be difficult.
