Comparing how to providing app to beta testers on mobile platforms

iOS

• Ask my beta testers which way they want to receive the build (maybe by email, host the build at someplaces,...)
• Ask my beta testers to provide their UDIDs
• Add them to provision list
• Create install file
• Send install file to my lovely testers

Windows Phone

• Ask my beta testers to provide their Live accounts
• Add them to the tester list
• Public the beta build to Marketplace
• My dear testers will be notified by Marketplace

Android

• Ask my beta testers which way they want to receive the build (maybe by email, host the build at someplaces,...)
• Create the build file
• Send it to my testers

Conclusion

Which way I prefer? Ofcourse, Windows Phone. Because:

• I don't need to care how to send the file to my testers
• With just one Live account, they can install on many devices as they want
• Another beta build? Just publish it!
• It "looks" more professional

Update: One thing we should consider when delivering beta builds to testers: Is it possible to upgrade to final build from beta build? AFAIK, it's possible on Windows Phone. About iOS and Android, I don't know yet. If somebody knew it, please let me know. Thank you.