i have 1 kdk fan and 1 euro uno. when i was shopping, all the shops told me that kdk and panasonic are the same i.e made in the same factory.

if you are looking for a fast fan, go for a 4 blade euro uno. if you are looking for reliability, 4 blade kdk.

4 blade is cheaper and faster. 5 blades just makes the fan go slower.

that is what i gathered from observing some of the fans in an electrical shop. the salesman told me that it is because they are using the same motor, and the extra blade makes it heavier and as such slower.