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1. Primary "hands on" training, where the student is getting actual one-on-one training from another force user (like a Jedi teaching a Padawan)

or

2. Secondary training, where the student learns only by opening holocrons or reading texts?

Depends on the teacher, imo.

Generally speaking, it's probably better for the student to receive hands-on training initially, just to make sure they have a solid base/platform to build on.

But once the student has some of the fundamentals down, Holocrons and texts potentially allow them to expand their overall knowledge/power/skill to a level far beyond what they may have ever been able to reach with a single teacher, as many of these items contain information that the teacher: a.) might not have even known, and/or b.) might not have wanted to teach the student. We've seen this several times in both canon and Legends.

Any specific examples?

Luke and Bane.

Hands on typically produces better sith and jedi.
Galan gave good examples that are exceptions