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Both browsers are based on Chromium engine and have almost identical performance and functionality. For "privacy" it's just about choosing between Microsoft and Google to send your telemetry data and linking your account.
Both browsers are based on Chromium engine and have almost identical performance and functionality. For "privacy" it's just about choosing between Microsoft and Google to send your telemetry data and linking your account.
The browser used is irrelevant for malware unless it exploits some vulnerability, so keep it up to date, don't open downloaded untrusted files and don't worry.
For the most privacy-friendly you can read the official thread Best Web Browsers for privacy.
Which is the fastest is hard to tell because it depends on the hardware, the test itself and most browsers out there are based on the same Chromium source code. Most likely I would say Chrome or Edge for additional proprietary optimizations on top of the open-source engine.