A little late but better than never. Personally I would have went with the 640, your choice. Something about the windows phone just makes them amazing. I'm on an android since my other phones don't work that well (Alcatel broken, waiting on it. And BLU win HD LTE with a keyboard issue). The windows phone environment is a lot more... User friendly. For example, on this phone I have octocore, 2GB ram, 16GB storage, lollipop 1920x1080, but... I lost visual fidelity. On windows my text was smaller. The battery lasted quite a long time, it wasn't the fastest, but it felt comfortable. I'm fumbling with android due to the UI size of everything.
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