Best drive encryption tool for OS vs "Data" drives

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I think additional context makes it clearer still:

For encrypting the drive your operating system boots from, we generally recommend enabling the encryption software that comes with your operating system rather than using a third-party tool. This is because your operating system’s native encryption tools often make use of OS and hardware-specific features like the secure cryptoprocessor in your device to protect your computer against more advanced physical attacks. For secondary drives and external drives which you don’t boot from, we still recommend using open-source tools like VeraCrypt over the tools below, because they offer additional flexibility and let you avoid vendor lock-in.

Also added this line to the Bitlocker on Home edition guide:

You may need to disable the non-Bitlocker “Device encryption” functionality (which is inferior because it sends your recovery key to Microsoft’s servers) if it is enabled on your device already before following this guide.