Bike cams

Hi. I'm looking at getting a video camera for my bike rides as nearly been taken out a fair few times and taken out twice. My choice are between the garmin virb and the hero 4. The specs are close its just battery life and use ability i'd like to know about (camera would be mounted to bike) of those forum users that use any of the devices above. My rides are generally between two to six hours in length. I'm aware a external battery pack may be needed for the longer rides if applicable to the devices? Thanks in advance
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