[bel8]

I can speak for Chrome's MCP which I have more experience.

devtools MCP will have access to more deep level fetures such as performance profiling, lighthouse and network requests in details (headers, auth, cookies...).

For example, I had success using chrome devtools mcp to debug frontend performance issues. The LLM captured and analyzed some nice traces and was able to isolate bottlenecks and unnecessary repaints and reflows.

[elAhmo]

Network request access is really helpful!

When having access to both backend and frontend, and then seeing what actual code is requesting and returning can really help with hunting bugs or doing basic QA.