Speaking of typesetting equations, how would people compare eqn versus
LaTeX? I used nroff for man pages, but I never did learn how to use
eqn for nroff.
I hate to be the one who says this, but when it comes to typesetting non-trivial mathematics, there is no competition: LaTeX beats eqn hands down. eqn is fine up to a point (and the neqn thing is kinda nifty for simple things on the terminal; you can kinda sorta get a rendered sigma for a summation, for example) but it breaks down pretty quickly.