既然兩個平台由同一個 SDK 驅動，為什麼有人選擇使用 Google Analytics for Firebase 而非 Google Analytics (分析) 4？

The correct answer is that app developers use Google Analytics for Firebase because it is app-centric and simplifies deep linking. Google Analytics for Firebase is specifically designed for mobile app analytics, offering features and integrations that streamline app development and user engagement, including deep link management. While both platforms share an SDK, their primary use cases and target audiences differ. Incorrect options: Marketers might prefer GA4 for broader insights across web and app, not Firebase solely for Android users. Analysts prefer GA4 for its comprehensive reporting across web and app, not Firebase for a "smoother UI" which is subjective and not its primary differentiator over GA4. Neither platform inherently offers superior privacy compliance over the other; both must adhere to relevant regulations, and GA4 is designed with privacy in mind.