Well, honestly, I don't much like thinning on top as I'm not a monk But it seems that the crown area does respond better to treatment but I've also seen excellent response from my temple areas as well.
This is such a broad and subjective question man. If I had a choice, the back would be better. It is easier to conceal with concealers and if you had a hair transplant in the future it would look more natural. Frontal hairloss is a b**ch. Now if you are balding in the ol' horseshoe pattern like myself.... god help us all.
Are u serius you have results in the temples? u mean maintenance or regrowth? What kind of vitamins do u take? tell me about it. Temples regrowth is the only thing that matters me the last 2 years!