As I should write essays and other kinds of writings in an academic style, I was wondering whether reduced relative clauses are formal or I had better opt for a non-reduced relative clause so that I should keep writing in a formal style.
Just to give an example:
1) Look at the man who is sitting...
2) Look at the man sitting...
Obviously, the meaning is the same, but I'm more concerned about the style of my writing, as aforesaid, theoretically speaking, I should write essays in a formal context.