May just be a matter of symantics... But be sure to distinguish between cinder blocks and concrete blocks. The latter are preferred nowaday since they are produced with more dense aggregate. I would definitely not build or buy a home with "cinder block" construction.
As to the difference between concrete block or poured concrete... If building a custom home, I'd go with concrete block foundation. However, if I were buying a home already constructed, neither concrete block nor poured concrete would rule the house out if it had an otherwise "ideal" basement for a model railroad empire. 
David
