http://invest3lyoumcsbw4a2x4fm43qqttid4fce3tt4wjhnlju726vkgkyyd.onion/ethereum-homestead/index16.html
At time of writing, bitcoin is secured by 3,500,000 TH/s, more than the 10,000 largest banks in the world combined. Ethereum, which is still more immature, is secured by about 12.5 TH/s, more than Google and it is only two years old and still basically in test mode.