Hi,
info spoke is bw 3.x version, open hub destination concept is bw 7.x version. both are same.
As per your bw version you can info spoke or open hub destination concept.
if you have very less data then go with flat file concept other wise choose table concept in open hub.
there is no specific cases to use them. its all depend on client needs.
for ex: if you client need to load the same data to another requirement. in that case if we have required data in flat file format then it can be used easily.
Thanks