Which one?

I prefer to use that which I find most useful in the situation I am facing.

To be honest, I think there pretty much the same. Except their just labeled differently. They mostly use the equal amount of materials and that they, in my opinion, both come from Mother Nature. The biggest difference, again in my personal opinion, is it's more about the path you take. By that I mean like, Wiccan, Paganism, Shamanism, Satanism etc. But I guess it's just all about one anothers opinion and speculation.

What I would say to most people that are using black magic is to be careful when using it because all ways remember the three fold law and if your not a really a Wicca then karma.

Many people other than Wiccans use the threefold law. And Karma is technically a Hindu/Buddhist belief as well. Karma effects you after you die if you believe in reincarnation or Karma.

Black and White magic are simply labels, and rather useless ones at that. Magic is neither black nor white. Any good intention can cause hurtful things just as any bad intention could cause helpful things.

For this reason, I called my magic "grey" for a very long time. I don't any more since I don't find those particular labels very helpful at all.

Magick has no colour and I don't really prefer one over the other. It's rare for me to cast spells, but when I do it's to help me or my loved ones when needed. [Example, a job spell or protection]

All magick is useful in some way, but it's up to the person. I don't curse people but for the same reason I don't cast love spells over people, the universe will work itself out. But I do know people who felt justified cursing someone who wronged them, it's all personal.

Personally, I like white. I want to help people.

Magic itself is neutral.

The black and white dichotomy refers to intent, rather than the magic itself.

Me, I practice a form of morality called the Crooked Path. It winds between heresy and holiness, capable of blessings and harm alike.

Many would consider my magical workings to fall under both, or simply as black (few, if any people, use magic only with ill intent).

To me black and white magick do not exist. There is no color to magick. Its only the intent of the user who casts them. Like say for example if that user wanted to put a curse or hex on someone that would be bad or to cause harm. But for good things like protection or healing spells are a great example.

To me it wouldn't matter what type of magic it is. All magic has a consequence and all magic is neutral. I only use it when I am in dyer need.

Magick has no colour but our intentions influence whether the spell is going to be good or bad

I personally use "Grey Magick" a lot as I use Magick more both Selfless and Selfish purposes