There seems to be too many to chose from. My suggestion is to watch dash cam videos on YouTube, check for clarity in both daylight and dark, see what cam is used the most often. Rexing seems to be used very often and with great clarity. When choosing a camera, see what else needs to be purchased for the installation. Carchet offers a very nice rearview mirror mounted camera that when the rear camera is on it acts like a rearview camera with much better angles. Like newer vehicles come with these days. I hope this helps.
