what differs of conventional or addressable style fire alarm system ？

Main difference：with addressable fire alarm control panel, you can pinpoint exactly which device has been activated，but conventional smoke detector and fire alarm system doesnot do that. Other differs, please go on read more...

Wiring differences
Addressable alarm systems connect devices using a loop. This is where one wire connects all devices to the fire control panel. Both ends of the wire loop connect to the alarm system.
With a conventional alarm, each device will be connected to the control panel via its own wire, rather than a shared one. One end of the wire will be touching the device, and another touching the conventional smoke detector and fire alarm system.

Which is the more cheaper?
conventional smoke detector and fire alarm systems cost a lot less to buy but are more expensive to install. This is because each device that is being connected needs its own wire. With addressable fire systems, one wire loop will connect several devices. This means conventional smoke detector and fire alarm system require more wire and more man hours during the installation phase.
Additionally, addressable fire systems have a range of other facilities that can help save money. For instance, addressable fire alarm panels monitor the air flow through smoke detectors to prevent the occurrence of false alarms, which can be costly to a business.

Which is more reliable?
The addressable alarm system is also the more reliable of the two. This is because the wire connects to the control panel at both ends (see the diagram above). If one end of the loop becomes severed, signals can still be sent to the control panel via the other end of the loop. Loop isolation modules are also used to separate devices on the loop. This means that if one device becomes disconnected, it won’t disable the circuit. With a conventional smoke detector and fire alarm system, if a wire has become severed, the device will become disconnected.

Overall
Functionally, the addressable fire alarm system is superior, which can help prevent costly activities and save time when detecting a fire. It’s also cheaper and easier to install. But in terms of buying price, a conventional smoke detector and fire alarm system is cheaper, and will meet the functional needs of small premises where a sophisticated system is not necessary.