Which metric card design?

I'm trying to decide between these two metric card designs.
They both display the same information.

Which is more readable? Which is more clearly labelled? Which would be quicker to scan?

If you'd like more context, see: https://www.getcopilot.com/

I'm planning a readability study using MTurk and SurveyMonkey. I'll follow up here with the results.

See attachments for full versions.

Thanks for your feedback!