In terms of price, Blueseasky wins the match. A true 4K camera with advanced parking mode options and remote wifi connectivity can be had for under a hundred dollars. You also get a free mobile app to configure and control the performance of your dash cam, which is very convenient from the driver's end.
Parking mode is a notable advantage of the B4K over the 622GW, which only has Intelligent Parking Mode. However, in terms of advanced features and dependability, we're rooting for the Nextbase 622GW, thanks to the built-in Alexa, image stabilization, extreme weather mode, emergency SOS, and the easily accessible MyNextbaseSuite to manage all your files and connectivity.
In comparison to the Blueseasky, the British brand Nextbase guarantees a longer life span for your dash cam - as evidenced by the reviews when compared to the B4K, which has had issues with both the app and the dash cam itself in the long run.
If you don't plan on using your dash cam for an extended period of time, the Blueseasky will suffice. However, if you want a 4K dash cam that you can rely on for a long time, the Nextbase 622GW is the dash cam for you.