The GoPro Hero 9 Black is the most powerful and versatile action camera you can buy, but collectively its new features don’t provide quite enough real-world benefits over its predecessor to justify the price.
The two biggest upgrades are its new sensor and front display. That new 23.6MP sensor shoots 5K video that does deliver slightly more detail than the Hero 8 Black, in the right conditions.
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https://www.techradar.com/reviews/gopro-hero-9-black