Best Practice: Perspective Change Script vs Property Binding Transform

This is still a bit too broad.

You use a transform to transform the value before it is used elsewhere.

You use a change script to react to a value changing.

Any time that you're using a script you have to pay the performance price for firing up the interpreter. That doesn't mean don't use them, it's just a fact of life. However, for transforms, if you can accomplish the task via another method (say an expression) then you should take that route.

Here are a couple of posts on the matter:

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