I wouldn't consider my prespray preference to be something that will ever be considered "finalized".
I think I would be doing myself a disservice to settle on one product exclusively, and stop checking out any others until I feel I have tried the great majority of what's out there, and will still always want to check out any new products that create a stir.
I'm riding the Grease Eraser wagon now, but I still try to slip in a random tub of XYZ whenever I get a chance.
I think it is important to test products in each owns individual conditions.
Everyones market conditions are different.
Everyones native water chemistry is different.
Every area has different dominant soil composition.
Any product considered the shiznit by one, will inevitably be considered crap by someone else, and the truth is, they will both be right, because each ones conditions are unique unto themselves.