Depends on how memory/storage intensive the tasks where:
"26.7TB of RAM and 2PB (petabytes) of disk space. "
One advantage of going with Amazon, is their really high-speed and voluminous ephemeral storage available per instance in addition to your EBS backed root volume.
They sounded completely CPU-bound from the blog post. They went with "high-CPU" c1.xlarge instances that had modest RAM and storage specs. They gave no details and expressed no concerns whatsoever about RAM or storage bottlenecks.
One advantage of going with Amazon, is their really high-speed and voluminous ephemeral storage available per instance in addition to your EBS backed root volume.