Myself I will never play the same set twice. Ive posted this a few times but ill post it again.
The way I build my Sets is by doing showcase pieces…showcase pieces are anywhere from 2 to 5 songs that go REALLY well together…some may be just out right Banging and making everyone go nuts…while others may be a 2 song build when i want to change the energy in the room.
I then string my showcases together using 1 or 2 tracks to get a proper flow going. I will use the same showcases and sometimes when new tracks come out i will interchange one of the songs in a 5 song showcase.
I then will read the room and dictate what showcase i want to put where. If the room has been going nuts for 20 minutes then i will let the energy die down so i can build it back up. This is where the TENSION and RELEASE aspects of DJing really shine.
IMO NEVER play the exact same set twice…change it up play it backwards cut it in 1/2 do something different. By playing the same exact set over and over its like making a Mix CD and just hitting play.