Door bell camera questions

I currently have 3 outdoor camera and thinking of moving over to a door bell camera for the front of our house. My questions are:

1) does the door bell stream video - we have two control panels, one in the kitchen so we can watch our kids outside. Just wondering with a door bell how does that work for the control panel

2) Anyone have opinions on what to use for front of house, door bell or standard outdoor camera

Thanks in advance.