Ask HN: Which icon should I choose for my cloud app?

I'm working on a new app, Unify, that lets you add all your cloud accounts to it. You can then seamlessly transfer files between your accounts (including whole folders), or download them to your phone. You can also stream movies, music, view documents, etc for all your cloud accounts.

Here is a poll I'm running for my current logo options:

https://99designs.com/icon-button-design/vote-ec0tf1

I'd really be happy if some fellow HN users could vote 1-5 stars on those entries to help me narrow it down some.