As I've spent a lot of time testing writing my Ring Pan-Tilt Indoor Cam review and my Blink Mini 2 review, I've put together a comparison to help you decide which best fits your requirements.
adding the Blink Mini, and setting a security PIN, I was able to tell my Echo "Alexa, tell Blink to arm the Office Cam" and it worked just fine. The command to disarm prompted a request for my PIN.