I just learned recently that the number of flights info posted on the info board could be misleading sometimes. For a flight that few airlines "code-shared" it will be listed as multiple lines. For example if SQ, SilkAir and MAS code-share a flight, it will be listed as having 3 flights coming in, but in reality there will be only 1 "shared" aircraft coming in. So sometimes need to take the info listed on the board with a pinch of salt. :)
What i did ?
EG
Terminal One - 3
Terminal Two - 3
Terminal Three - 6
Budget Term - 2
Me knn go Terminal Three !!!