We've got the Leapfrog LF915HD as a lot of the Leapfrog ones came out well reviewed by Which. Nice big screen, can control the camera angle and zoom from the monitoring unit, and can talk to baby through the camera (helpful when telling a 3yo to get back into bed!)
I’ve got this one - https://amzn.eu/d/gN8lPrn x
BabySense!!!
I’ve just bought a Baby Sense non WiFi one. It was recommend by friends and is currently on sale