在纯ActionScript 3项目中，有没有理由在ExternalInterface类上使用Adobe的Ajax Bridge？

I am writing a pure actionscript 3 application in Adobe Flex. I want my application to be exposed to scripting in a browser. It seems that there are two options: Adobe's Ajax Bridge (typically used with a Flex application that uses mxml?) and Adobe's External Interface class (flash.external.ExternalInterface). Is there any reason to use the Ajax Bridge over the ExternalInterface class?I am writing a pure actionscript 3 application