Baby Monitors: phone or actual monitor?

Parents, please help us out!

We are between a baby monitor that comes with a literal monitor and choosing a baby camera that goes through our phone.

Which do you prefer and why?

Also: If you do the phone thing, do you have to leave your sound on to be notified? My biggest concern if I get 900 notifications and I do not want my phone chiming 900 times if it’s not baby related.