"Way of learning" is a very broad term, and the two ways may be good for different aspects of it.

Verbatim copying is good for bringing your attention to the material, it helps you notice more, and doesn't let you mind wander. While summarizing is good for cementing what you've noticed and learned.

For example, if I try to copy part of text I see the writing techniques used there a lot better. I don't see how summarizing can give me the same effect.

I'm almost ready to try both techniques simultaneously, although it seems like an overkill, so much writing.