Wyze cam vs Wyze door bell

I have a Wyze cam in front of my main door.
I am thinking to put a Wyze door bell there instead.
My question is that what Wyze door bell can do but Wyze cam cannot do (other than the bell)?
I asked that because I can see a wide image in my cam, I can set the direction of my cam point to the ground so that I can track whether I receive anything. It will also automatically notice me if there is anyone nearby the door. So do I have any reason to buy a new toy (the door bell)?

This sounds a lot like another discussion I replied to today. I personally preferred the V3, if you have a good position for it:

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