How to make TikZ style conditional on comparing two numeric style parameters?

Question

I have a nested foreach, where each loop is over the same number range. I want to apply a style dependent on the relation between the numbers (\m and \x in the example code), i.e., whether they are equal, the first is lower than the second, or the second is lower than the first one.

I prefer a solution with tikz styles as long as its not extremely complicated, other solutions are acceptable, too (like using macros).

Example Code

The code could look like this (with the stye conditional style not implemented).

\documentclass{minimal}
\usepackage{tikz} 
\begin{document}

\foreach \m in {1,...,3} {%
\noindent
\begin{tikzpicture}
    \foreach \x in {1,...,3} {%
        \node[conditional style=\x wrt \m] at (\x,0) {\x};
    }
\end{tikzpicture}
\par
}
\end{document}

Expected Result

In the following output, strike through, bold and plain are used as exemplary styles, because SO doesn't allow colored text afaik.

1 2 3

1 2 3

1 2 3

Answer 1

This was much easier than expected. The following style even allows specifying the conditional styles as arguments.

\documentclass{minimal}
\usepackage{tikz} 
\begin{document}

\foreach \m in {1,...,10} {%
\noindent
\begin{tikzpicture}[%
    compare/.code n args={5}{%
        \ifnum##1<##2
            \pgfkeysalso{##3}
        \else
            \ifnum##1>##2
                \pgfkeysalso{##5}
            \else
                \pgfkeysalso{##4}
            \fi
        \fi}
    ]
    \foreach \x in {1,...,10} {%
        \node[compare={\x}{\m}{blue}{black}{red}] at (\x,0) {\x};
    }
\end{tikzpicture}
\par
}
\end{document}

Output

Answer 2

You can evaluate a condition and pass it to your own style keys

\documentclass{article}
\usepackage{tikz}
\tikzset{
  mystyle/.is choice,
  mystyle/.default=0,
  mystyle/1/.style=mytrue,
  mystyle/0/.style=myeq,
  mystyle/-1/.style=myfalse,
  myeq/.style={black,draw},
  mytrue/.style=blue,
  myfalse/.style=red
}
\begin{document}
\begin{tikzpicture}
\foreach \m in {1,...,10}{%
  \foreach \x in {1,...,10}{%
    \pgfmathtruncatemacro\mychoice{ifthenelse(\x==\m,0,{ifthenelse(\x>\m,1,-1)})}
    \node[mystyle=\mychoice] at (\x,-\m) {\x};
  }
}
\end{tikzpicture}
\end{document}

Note that minimal class is not meant for users but for LaTeX developers. The actual minimal class for end users is article.