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The application that is best for managing network connections on macOS is System Preferences. This is the primary interface through which users can access and configure a multitude of system settings, including network settings. Within System Preferences, the Network pane allows users to manage various network connections such as Wi-Fi, Ethernet, and VPNs. Users can easily add, remove, or adjust the settings for these connections, making it a comprehensive tool for network management.

While Terminal provides command-line access to network configurations and settings, it tends to be more complex and less user-friendly for those unfamiliar with command-line tools. Network Utility provides useful information and diagnostics about network performance but does not offer configuration options. Similarly, Wireless Diagnostics is a specialized tool for troubleshooting Wi-Fi connections and analyzing wireless network performance, but it does not provide overarching management capabilities for all types of network connections like System Preferences does. Therefore, for general network management, System Preferences is the most effective and user-friendly choice.