Richyrich,
"USALS works best; because it does all the moving for you when you program (and you do not program a satellite position; it knows with math). DISEq 1.2 requires you to number your satellites position, and move to each before programming or saving them.
Also, if your dish is out of alignment; USALS will not work! "
Your last sentence leaves the impression that DISEq 1.2 will work if the dish is out of alignment.
If the dish is not tracking the arc correctly then neither method will work.