Ok, you can choose not to believe us LOL, but anyone that has had a camera on a less than ideal MP/sensor ratio has proven that at night the lower MP camera on the same size sensor results in better images.Because I'm not going to have any light issue lol! I have plans to install bright lights auto on at evening time.
You are falling for the more MP trap.
Most here will say that 4MP is the sweet spot four surveillance cameras. Especially if you want to IDENTIFY more than 18 feet away.