Camera Quality
Blink Outdoor 4: 1080p, good day quality, basic night vision. Arlo Pro 5: 2K HDR, colour night vision, spotlight. Arlo is clearly better on image quality.
Battery Life
Blink: up to 2 years on 2 AA batteries — the longest battery life of any security camera. Arlo: 6 months on rechargeable battery. Blink wins on battery longevity.
Subscription
Blink basic plan: $3/month per camera or $10/month unlimited. Arlo Secure: $13/month. Blink is significantly cheaper.
Alexa Integration
Blink integrates natively with Alexa — Amazon owns Blink. Live view on Echo Show, arm/disarm, announcements. Arlo works with Alexa too but less deeply.
Local Storage
Blink supports local storage via a USB flash drive in the Sync Module 2 — a unique free option. Arlo supports local USB storage on SmartHub. Both offer local option.
Video Quality at Night
Blink has standard black-and-white IR night vision. Arlo Pro 5 has colour night vision with an integrated spotlight. Arlo is dramatically better at night.