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\usepackage{iftex}

\ifPDFTeX
...
\else
...
\fi

\ifXeTeX
...
\else
...
\fi

\ifLuaTeX
...
\else
...
\fi

\RequirePDFTeX
\RequireXeTeX
\RequireLuaTeX

\usepackage{ifxetex}
\ifxetex
...
\else
...
\fi

\usepackage{ifthen,ifxetex}
\ifthenelse{\boolean{xetex}}{..<true>..}{..<false>..}

\usepackage{ifluatex}
\ifluatex
...
\else
...
\fi

\usepackage{ifpdf}
\ifpdf
...
\else
...
\fi