My thought process is this:

Who's old enough to talk about a life full of battles? Laguna, Kiros, Ward, Cid, Edea, Martine, Dr Odine...
Who's probably fought in a life full of battles? Laguna, Kiros, Ward, Edea maybe
Who would say "pisses me off?" Zell, Seifer, Irvine maybe
fffffuuuuuuuuu no match ups.

I'm going to say Zell.