Ajax: Potentially lower ongoing cost, especially if self-monitored. The big investments are upfront equipment — hubs, sensors, add-ons.

ADT: There’s likely a higher ongoing cost because of the professional monitoring. Plus, depending on how you get ADT, there might be installation costs or contract terms.

Ajax offers a very modular and flexible ecosystem: motion detectors, door/window sensors, sirens, leak sensors, fire sensors, CO detectors, etc. (Plus smart automation.)

Because Ajax is very “component-based,” you can build something very tailored to your property.

ADT also supports expandability — they have a wide device catalog, smart devices (cameras, locks, sensors) — but you're generally more “locked in” to their hardware or monitoring model.

Also, with ADT there may be proprietary aspects (depending on the system) that make swapping out components harder if you want to move to a different provider later.

Ajax is built with anti-jamming and tamper protection in mind. The Jeweller protocol has mechanisms for detecting interference and switching frequencies. Ajax Systems

Ajax devices often have very good encryption to protect data communication. Ajax Systems

Ring is more consumer-focused; while it does have protection and a decent alarm system, its reliance on Wi-Fi and “standard” communication can make it somewhat more vulnerable to connectivity issues (especially if someone tries to disrupt the Wi-Fi).

• More robust radio protocol (Jeweller) → higher reliability, lower latency, more secure, better range.
• Better redundancy via cellular + Ethernet + Wi-Fi, so less likely to go offline.
  
• Very long battery life on many sensors.
  
• Strong tamper / jamming protection.
  
• More “serious security system” feel — closer to what security companies might install.
  
• No mandatory monthly fee if you self-monitor (potentially lower long-term cost).

Uses a proprietary “Jeweller” radio protocol for communication between the hub and sensors. This gives: two-way encrypted communication, frequency hopping (to resist jamming), authentication of devices, etc. Ajax Systems Support+1

According to Ajax, their Jeweller protocol can deliver an alarm in under 0.15 seconds, and the system supports a long range (up to ~2,000 m in an open area) between devices. Ajax Systems Support+1

Brinks systems are often built around Alarm.com platform (depending on their package) that adds cost. This gives flexibility, but the wireless communication is more “standard” (not the specialized protocol that Ajax uses).

Brinks offers cellular backup for its monitoring (important so the system can still communicate even if the internet goes down).

Because it’s a more “traditional security company” model, some users report issues around installation, devices, or response.

The Ajax hub supports multiple communication channels to send alarm signals: Ethernet, Wi-Fi, and LTE/4G. Ajax