With Google Voice, I can have a separate, personalized voice mail greeting for each and every contact (or group of contacts). So, for my co-workers, I have a separate greeting (more formal). For my peeps, I have another (not-so-formal) greeting. For everyone else, it's a basic, non-evasive greeting.Google voice has free transcription, but I don't think it has the same customizable greetings YouMail does. I did like the transcription when I used google voice.
Using Google Voice on my iPhone is a snap because all my contact are sync'ed with it, along with my calendar. It's optional to have all these in sync–you don't have to.I have google voice but I stopped using it once I switched from Android to iPhone. It's great to use with Android because everything syncs so naturally. Installed YouMail to try it out and seems okay so far. My fiancé doesn't like that it greets her by name haha.