The phone running on stock Android provided by Google steals the show. As the software department is taken of by Google and hardware is made by companies under the android one project so this phone is having that support which gives it updates for 2 years and currently it’s running smoothly on marshmallow that’s Android 6.
The software is optimized for the hardware by Google therefore the performance is very very smooth and satisfactory. Also, security updates by Google helps a lot.