Uplink Provider Networks - UUNET, Cogent, etc

Are there any good or bad sides with uplink providers? I know their coverage maps differ, but really, is it as big an issue as sites make it out to be? For instance:

Premium Cogent-free bandwidth!

I've seen that a number of places. Is it just premium routing? I don't know how some networks can be better than others other than the routing of data and the speed of that data.

Thanks members!

 

 

 

 

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