Choosing to use carrier DNS or public DNS depends on your needs and preferences. Here are some considerations:

Operator DNS:

1. Speed ​​and availability: Carrier DNS is usually closer to your location, so it's likely to be faster. Additionally, operators typically invest significant resources in ensuring the availability of their DNS servers.

2. Integration: If you are using an Internet service provided by a carrier, it may be simpler to use its DNS servers because they are usually more tightly integrated with the carrier's network infrastructure.

3. Content filtering: Some carrier DNS may include content filtering capabilities that can help block access to malicious websites. This provides some security.

Public DNS:

1. Speed ​​and availability: Some public DNS services, such as Google Public DNS and Cloudflare DNS, have excellent performance and global coverage, so may be faster than carrier DNS.

2. Privacy: Some users are concerned that operators may collect DNS query data for analysis or ad targeting. Public DNS services are generally more focused on user privacy and promise not to log DNS query data or target advertising.

3. Cross-network availability: Public DNS services are not tied to specific carriers, so you can maintain consistent DNS performance and privacy no matter which Internet service provider you connect to.

4. Additional features: Some public DNS services provide additional features such as DNS over HTTPS (DoH) or DNS over TLS (DoT) to enhance security and privacy.

In summary, you can choose between using carrier DNS or public DNS based on your personal needs and preferences. If you are very concerned about privacy, want faster DNS resolution, and are not tied to a specific carrier's network, a public DNS service may be a good choice. If your carrier provides excellent DNS services and you have needs for content filtering or other specific features, you can continue to use carrier DNS. In addition, some people also choose to use a hybrid configuration, configuring multiple DNS servers at the same time to improve fault tolerance and performance.