Is any downside in using align instead of \[...\]?

Is any downside in using align instead of \[...\]?

Is any downside in always using the align environment? I.e, if I use
\begin{align}
a&=b
\end{align}
instead of
\begin{equation}
a=b
\end{equation}
and
\begin{align*}
a&=b
\end{align*}
instead of
\[
a=b
\]
would I see a difference in output?