Richard,
Can't say I really "like" one better than the other, I know ADP far better and well enough to know that in all reality just about all the DMS being offered to the dealers suck. Each one just sucks in it's own way, and as you get more used to them they each have certain areas that they do better or worse.
Have you ever showed anyone from another industry the software we are expected to manage our inventory with? I have and they laughed. Whether it be ADP, Reynolds or Dealertrack they are all extremely archaic. All of them are just GUI's on the front of old and tired code. Someday someone is going to start from scratch and blow us all away with real software.
Hang in there, it will get easier. I actually hate Dealertrack a lot less than I used to. Maybe someday they will even get me the report writer and I will say something nice about them
.
Good luck,
Gerry