Think about the size of your home and your daily routine when deciding which brand/model to buy. If you'll be making calls during nap time, for example, look for monitors with lights that let you know when your baby is awake. Of course you can accomplish the same thing by turning down the sound on a video monitor, but lights are more likely to catch your eye.
The Nest boasts some impressive hardware specs, such as true 1080p/30fps video and a 3-megapixel camera sensor. Setting up the Nest Cam specifically to look in on a 2-year-old at night, we found the video quality on Nest's camera to be sharper and more detailed than on any baby video monitor we tested. The Nest Cam includes push-to-talk features as well as alerts triggered by motion or sounds. And when your child is past the age when you need a nighttime monitor, you can repurpose the Nest Cam to check in on other parts of your home.
It really depends on what you feel most comfortable with. There are audio monitors that allow you to listen to any noise coming from the nursery, vital monitors that track sleep and breathing and video monitors that add sight to sound. Babylist parents overwhelmingly choose video monitors. The security of seeing what your child is up to—like if they’ve gotten tangled in their swaddle, pulled their diaper off or climbed out of the crib—can be worth the extra cost of a video monitor.