Yikes... that's a loaded question. I tend to use the phaser a lot to give a little more interest in tunes where I'm not play a ton of notes (mostly holding roots and changes). I use the chorus with a slower, shallow setting on tunes where I'm playing more melodic stuff, and with that I tend to use a very fast delay with almost no repeats. The only thing I don't use a lot is the filter, but I use the chorus with the sub-n-up quite a bit to blend the octave into my tone a bit more.... I hope some of that makes sense.

(the EBS uni-chorus can also be used for modulation or flange)