docs: add comparison

docs/content/docs/comparison.mdx

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+---
+title: Comparison
+description: Comparison of Better Auth with other auth libraries and services.
+---
+
+> Comparison is the thief of joy. – Kanye West
+
+### vs Other Auth Libraries
+
+- We probably support the framework you are using.
+- You need more featuers from your auth library.
+- You need advanced features like two-factor authentication, multi-tenancy, multi-session, admin tools, rate limiting, etc.
+- You want to have more control over your auth flow.
+- You prefer more comprehensive documentation.
+
+### vs Self Hosted Auth Server
+- You want to keep your users on your own database (the same database as your app).
+- You need more control over your auth flow.
+- You don't want the hassle of self-hosting your auth server.
+- And there is a high possibilty that we cover more features you need. And you can alway extends it using our plugin system.
+
+### vs Managed Auth Services (paid)
+
+- You don’t want to give up user data to a third party.
+- You want a single source of truth for your users.
+- You prefer not to pay for authentication.
+- You want to keep your users on your own database (the same database as your app).
+
+### vs Roll Your Own Auth
+
+- You don’t want to maintain a lot of code that isn’t your core business.
+- You want to deligate the security to a community of people who probably care more than you do.
+- We probably cover most of the features you need, and you can always extend it using our plugin system.