Best Google Drive/DropBox app for Windows Phone?

Google seems to hate Microsoft (e.g. see YouTube app). But I am still hoping and searching for a good Google Drive app for Windows Phone.

I found some good apps but each has its own advantages but also disadvantages.

Google Drive on WP

URL: http://windowsphone.com/s?appid=b3e46abe-5fc6-48c5-b4ab-c27acc4d5308

• Version: 0.9.8.4
• Price: free
• Also displays shared items
• A bit slow

File Manager

URL: http://windowsphone.com/s?appid=42380d5b-b735-4913-80f6-c78b85c18dc2

• Version 1.2.1.0
• Price: € 1,49
• Free: Only one account at time
• OK for simple Google Drive usage
• Other implementations
  • DropBox implementation sucks
  • FTP
  • SugarSync
  • …

BoxFiles for Dropbox

URL: http://windowsphone.com/s?appid=6ca15174-a206-40ef-a792-d95d60098f9a

• Version 3.16.0.0
• Price: 4 editions / confusing
• Free: Ads
• OK, for DropBox

HELP!

If you know a really good app, specially for Google Drive, please let me know!