[Tex/LaTex] align vs equation

amsmathequations

I always use align in my documents, and avoid equation. Is there anything wrong with that? My reasoning behind this: align > equation, so why not use it?

While not exactly a bad idea in principle, unfortunately it is a bad idea in practise because align doesn't have the same feature as equation whereby less vertical space is added if a small equation is displayed after a paragraph that ended early on the line. For example, consider

\documentclass[twocolumn]{article}
\usepackage{amsmath}
\begin{document}
hello
$a+b=c$

hello
\begin{align}
a+b&=c
\end{align}
\end{document}


You should easily be able to see the extra space after the second ‘hello’.