There will be no "correct" answer to such a subjective question, it will all come down to opinion.
What you shoudl be asking is which Data Centre will meet *your* requirements - and to do that you'll have to work out what you want !
24/7/365 Access - with what time delay, what procedures
24/7 Security or a plastic guard dog
FM200, FM2000 or a bucket of sand Fire Supression
Managed/Hands on service or go-it-alone
1amp, 10amp, 100amp power
How much space and what the expansion options are
etc etc etc
Until you know what you'd like, matching the requirements to *any* DC wont be any good to you.
Every facility has it's good and bad points, and many of the items which you might consider to be essential are available at only a few, and may be "extras" on the cost etc.