Question 1

Which is better, Marshall Stanmore III or Sonos Era 300?

Accepted Answer

Both products scored 8.5/10 in our testing — it's a tie. Choose based on which features matter most to you.

Question 2

Is the Marshall Stanmore III worth it over the Sonos Era 300?

Accepted Answer

The Marshall Stanmore III scores 8.5/10 while the Sonos Era 300 scores 8.5/10. The Marshall Stanmore III is our "Best Overall" pick in the Best Bluetooth Speakers for Gym Trainers 2026 category.

Marshall Stanmore III vs Sonos Era 300: Which to Buy?