http://www.webhostingtalk.com/archive/index.php/t-726917.html
There are two different "tier" ratings being discussed here. Tier as in Data Center and Tier as in Network. Although the websites may very well talk about Tier 1 and Tier 4, I am confident they are talking about different Tiering.
Data center Tier ratings are Highest Number Best (like football), Network Tiers are lowest number best (like golf). Data center Tiering (Uptme Institute) is based primariy on Utility Redundancy, Network Tiering is based primarily on backbone sizing and peering locations (Level III is Tier I, American Fiber is Tier II).
Which of these you need is entirely dependent on your need for speed and guaranteed uptime. You will pay more for the finest, but if you need it, you need it.
Most people don't need either Tier III or Tier IV Data Centers, and unless you really need high speed, you don't necessarily need Tier I bandwidth (although I don't work with Tier II simply because of Customer impression that Tier I are really really superior, which in a lot of cases they are not).
http://www.webopedia.com/FIG/DATA_CENTER_CHART.jpg
http://upsitetechnologies.com/
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