𝐂𝐡𝐨𝐨𝐬𝐢𝐧𝐠 𝐛𝐞𝐭𝐰𝐞𝐞𝐧 𝐨𝐛𝐬𝐞𝐫𝐯𝐞𝐫𝐬 𝐚𝐧𝐝 𝐩𝐥𝐮𝐠𝐢𝐧𝐬 𝐢𝐧 𝐌𝐚𝐠𝐞𝐧𝐭𝐨 2

Choosing between observers and plugins in Magento 2 depends on the situation and your goal. Here's a guide to help you decide based on coding standards, best practices, and execution priority.

𝐔𝐬𝐞 𝐚 𝐏𝐥𝐮𝐠𝐢𝐧 𝐖𝐡𝐞𝐧:
✅ You want to modify the behavior of a public method of a class
✅ You need to:
- Modify arguments before the method runs (before plugin)
- Modify the result after the method runs (after plugin)
- Completely override the method logic (around plugin)
✅ You want fine-grained control over specific methods
✅ You care about execution order and want it to be more predictable

𝐄𝐱𝐚𝐦𝐩𝐥𝐞𝐬:
- Changing product price calculation
- Modifying cart add logic
- Intercepting checkout behavior

Notes: Plugins are preferred over observers for extending or modifying business logic, especially if it’s scoped to a single method.

🔁 𝐔𝐬𝐞 𝐚𝐧 𝐎𝐛𝐬𝐞𝐫𝐯𝐞𝐫 𝐖𝐡𝐞𝐧:
✅ You want to listen to a system-wide event (like sales_order_place_after)
✅ You don't need to modify any return values
✅ You want to keep your code loosely coupled
✅ Multiple modules might respond to the same event

𝐄𝐱𝐚𝐦𝐩𝐥𝐞𝐬:
- Logging events
- Sending custom notifications
- Triggering third-party integrations

Notes: Observers are better for broad actions that should happen in reaction to something, not for modifying behavior.

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