cancun555

I currently have analog BNC set up. I want to get a new system with Mega-Pixel cameras. I was able to find analog BNC 8 ch 4MP camera system for $450 w/ 8 cameras (https://www.costco.com/.product.1112561.html). I found a POE system 8 ch 4MP camera system $600 w/6 cameras. Audio in all. (https://www.samsclub.com/sams/8ch-1080p-nvr-8x4/prod16050413.ip?xid=plp:product:1:5) I am not sure which one is better to get? Audio in all cameras would be good but for the price I dont know if its worth it. Will I see a difference in these two? When I zoom will I get same clarity on both? or what about sharpness of the face or license number? Please help