Data Center Comparisons

Anyone willing to give a summary of reputation of data center companies. Thinking about capital, turnover, acquisitions, expansion, development, track record. Seeing a lot of roles for both land acquisitions and corporate M&A and know nothing about DC firm reputations. I know Panattoni recently took the entire Colt team in London for EU expansion. 

Admittedly an EU monkey but happy with US overview as well since they are so global. Thinking about Equinex, Digital Realty, Cyxtera,  CyrusOne, Colt Data Cenders, Pure Data Centers, etc