It really depends on the individual and their learning style.
There are some people who learn visually, and some who learn auditorily, and others kinesthetically. It really depends on your preference.
There is another school of thought by Howard Gardner regarding multiple intelligences which a lot of educators are trying to incorporate in schools.
Since you give two options in your question, I'd say visual learning is more the norm than text learning, although using a variety and combination of methods is definitely much better =)