I wanted to know which rods are the best for healing? It it dependent on the person or is there a specific rod which takes higher Precedence over the rest?

Ummm this is one major broad question.
The reason why I say so is as such:
Copper Rods, Crystal Rods Or Pendulums all are used for different things that I have come across. Even though they are pretty much the same thing I have just in my limited experience seen that
Copper Rods: used for finding laylines, size of aura's or underground water sources or for that matter even an underground pipe...etc etc
Pendulums: used as a divination tool (question-answer) and also to find directions for which things lie in. From chakra's to laylines etc etc (the list goes on and on)
Crystal Rods: Haven't actually seen but I would assume the same as the rest except that the crystal will add its own kind of properties to the exercise.

Now I know that some ppl use these methods alot and could prob add alot more worthy info here as I have only really just touched on it in the past...but the reason why I say the question is broad is that healing can happen in just SO many ways. (as you prob are well aware of)
That I would say to choose between the 3 would be very difficult and no one could tell you what the choice is, only what worked in their personal experience, and so I would say try them all and see which ones bounces out at you and resonates with you more.
RR

Hmm to add my tuppence worth i think what Rose red says is absolutely right.

I do think that from a medical point of view that copper has alot of properties and is extremely good for certain types of healing.

I also use quartz rods for healing and have three specifically for that purpose.

there are a number of good books that would give you the basics on crystal therapy.

Suzi