Which BIOS is the strongest in terms of privacy and security?

I have ThinkPad x230 / x230i / t420 now and want to update BIOS. But I don’t like closed source BIOS like Lenovo has. So I’m looking for an open source BIOS. So the question is: Which BIOS is best for privacy and security? Which is better, libreboot or coreboot? Also, please let me know if you like sites and videos on how to update and install!

2 posts were merged into an existing topic: How can I update the open source BIOS on ThinkPad?