yadda yadda yadda, blah blah blah. thanks, zombie54274567.
Well, the real test is, dual boot, get used to both systems for a few months and then see what you yourself think.
If you only have windows, then how will you ever know? (is my advice tto your brother) linux does not cost anything, so what has he got to lose?
if he will not dual boot then he is simply a coward, sorry to say.