Nest models are constantly being updated, so it can be hard to keep track of which one is best. The newest model, the Nest Cam IQ, is the best Nest model yet. It has a 4K sensor and can stream live video to your phone or tablet. It also has facial recognition and can send you alerts if it sees someone it doesn't recognize. If you're looking for a Nest camera that's less expensive, the Nest Cam Indoor is a good option. It doesn't have 4K streaming or facial recognition, but it's still a great camera.