The big noticeable difference is that Microsoft enabled the features for both platform’s wearable products, Apple Watch and Android Wear.
I tested the iOS Google Translate app on my iPhone and Apple Watch, and it works pretty well.
The iOS app for the iPhone offers a way to both speak and type your words, while the Apple Watch only offers the speak-to-translate option. Not all languages will talk back to you with the translation. Speaking in English and asking to translate to Spanish will read back the Spanish translation; asking it to speak the Hebrew translation does not work.
In addition, you cannot speak to translate in all languages, such as Hebrew, but you can in many.
The app supports the following languages: Arabic, Bosnian (Latin), Bulgarian, Catalan, Chinese(S), Chinese(T), Croatian, Czech, Danish, Dutch, English, Estonian, Finnish, French, German, Greek, Haitian Creole, Hebrew, Hindi, Hmong Daw, Hungarian, Indonesian, Italian, Japanese, Korean, Latvian, Lithuanian, Malay, Maltese, Norwegian, Quer’etaro Otomi, Persian, Polish, Portuguese, Romanian, Russian, Serbian (Cyrillic), Serbian (Latin), Slovak, Slovenian, Spanish, Swedish, Thai, Turkish, Ukrainian, Urdu, Vietnamese and Welsh, and Yucatec Maya.
But the speak-to-translate option only supports about 30 of these 50 languages listed.
Google Translate is similar, in that it does not currently offer the speak-to-translate function in all of the supported text-to-translate options.
Here are some iOS screen shots of the app on the phone and watch:
For more details, check out the CNET coverage.