66 Audio BTS Pro vs Bose QuietComfort 35 II

The BTS Pro is quite robust and can withstand some minor splashes of sweat or rain as these are sweat-proof. They are not completely water-proof though, so you should not get them soaking wet.

There is good detail in the highs and the mids can also be heard clearly with very little muddiness. The lower frequencies are boosted, resulting in a good level of depth and power to each bass thump.

The BTS Pro ear cups sit on the ears with hooks keeping them in place. The flexible connecting band provides good clamping force and can adjust to your head size with continued use. Combined with cushioning on the cups, these are comfortable to wear and will stay in place.

Bluetooth connectivity allows the BTS Pro to connect with smartphones and compatible music players wirelessly, so cables won't be an issue.

66 Audio's Motion Control iOS App gives users added functionality, including EQ control and presets selection, battery status indicator, and even headphone position tracking. These features can improve the listening experience and also minimize the chances of you losing these headphones.

With up to 40 hours of playback time at full charge, it's more than enough for most listening sessions. You won't have to charge these frequently.

A hard shell carrying case is included, which can protect the headphones from minor impact and also make transport much easier. The case also has good aesthetics.

They are easy to bring on the go as the ear cups can be folded into the headband. This further reduces the already slim and compact size, making them easy to chuck into a bag when on the go.

The right ear cup of the BTS Pro features buttons for controlling headphone features. You can play/pause tracks, increase/decrease volume as well as answer/end calls by pressing the corresponding buttons, negating the need to pull out your phone to do so.

You do not need to take the BTS Pro off in order to answer incoming calls. There is a built-in microphone which allows you to easily take or make calls in the middle of your run or workout.

Most full-sized, wireless over the ear headphones are quite heavy and bulky. The QC 35 IIs on the other hand are relatively compact and light, yet still deliver great performance, battery life and top notch noise cancelling.

The integration of Google Assistant is also a first in headphones, and gives you a host of smart features like notification reading, quick music searches and call making using voice commands and many more.

Bose's noise cancelling tech is quite effective at blocking ambient noise. This will help you fully enjoy the music by virtually eliminating outside noise.

Bass is full and punchy. While the sub-bass is not pronounced, there is good and fast bass extension, and this is what gives the music punch and a sense of tightness.
The mids are full and slightly forward so vocals and guitars can be clearly heard.
The highs are clear and do not distort at high volumes. There is a peak on the upper treble which helps to add more detail and clarity to the music, but some may also find the high frequencies to be quite harsh at times.

These headphones are much more convenient to use and functional thanks to the Google Assistant upgrade. Press the long, flat button on the left ear cup to activate the feature, and you’ll be able to make voice commands to search for music, start calls, set reminders, get weather updates and many other features. This addition makes the QC 35 II one of the best travelling headphones you can get today.

Aside from Bluetooth connection, you can also connect the QuietComfort 35 II to a source using a 3.5mm cable. This makes the headphones usable even with the battery depleted.

You can easily control playlist functions using the buttons on the right ear cup. These functions include volume control as well as the play, pause, next track and previous track commands. The on/off switch for the headphones is also on this ear cup.

The QC35 IIs can play music continuously for up to 20 hours. This should cover most of your trips' duration before needing to recharge.

Multiple microphones are strategically located on both ear cups, allowing for great voice quality when taking calls. The noise cancelling also helps to clean up the voice quality that goes into the headphones.

You can simply press a button on the right ear-cup to answer a call. This reduces the hassle of having to remove the headphones to take a call.

Despite having internal batteries, these headphones are still fairly lightweight, coming in at under 300 grams. This makes the headphones really easy to wear for extended periods, even when you are on the go.

The QC 35 II's ear cups and headband feature quality memory foam material which are soft and supportive so they do not pinch on your ears or apply too much pressure to the top of the head. These contact points are also covered with a quality leather material which feels nice and smooth on the skin.

With these, you won't have to deal with long and dangling cables that can be difficult to manage.