RebYidd: they all gave the potential of being loaded with garbage.
As zahavasdad pointed out, printed materials can also contain garbage. I understand the dangers of portable internet connectivity, but that doesn’t seem to be your issue.
Given a choice, I prefer learning from a sefer, but that’s my personal preference.
I’ve seen serious talmidei chachomim using a laptop with Otzar Hachochma in the bais medrash.
If someone can have thousands of seforim available in portable format or an Artscroll Shas for someone who benefits from that, it could enhance his learning, and in my opinion is not much different than listening to a shiur in the car. Even granting that a paper sefer is better, the portable electronic device makes the seforim available when the paper version is not.