A Transient Data Queue(TDQ) is an area that can be accessed
across CICS region and even by batch applications. In most
of the business models, all daytime CICS activities are read
and processed in batch in the night. The TDQs act as
temporary databases which hold these transaction details and
get deleted once read.They are read destructive.

A temporary storage queue(TSQ) can only be accessed by
programs and transactions from the same CICS region.They
cannot be accesed in batch. They can be read over and over
again unlike a TDQ. They are best used to transfer data
between multiple transactions in the same region.

While implementing Page-up and page-down logic, TSQ is very 
useful, the reason behind is, it hold entire data even the 
control is returned to CICS.

TDQ is useful when there is requirement for message routing 
or printing of messages once the trigger level is reached