DB datafile setup

Hi all,
We build up a new sql 2012 db for storing picture data with some few selects on that data.
All disk are SAN and we expect the data at ~ 1 TB.
How should I setup datafiles for this DB?
Multiple files ( 5 x 200 GB) ? Why splitting up ?
One big file ?

What would be the best practice?

Thanks for your support
acki4711