This is a solution using tikz
\documentclass[tikz, border = 5pt]{standalone}
\usetikzlibrary{matrix}
\usetikzlibrary{calc}
\tikzset{
table/.style={
matrix of nodes,
row sep=-\pgflinewidth,
column sep=-\pgflinewidth,
nodes={
rectangle,
draw,
text width=6em,
align=center
},
minimum height=1.2cm,
text depth=0.5ex,
text height=2ex,
nodes in empty cells,
row 1/.style={
minimum height=0.5cm,
},
column 1/.style={
nodes={
text width=3em
}
}
},
circ/.style={
draw=green,
circle,
fill=white,
thick,
minimum width=0.8cm
}
}
\begin{document}
\begin{tikzpicture}
\matrix (table) [ampersand replacement=\&, table]
{
\& Scenario 1 \& Scenario 2 \\
Val 1 \& $\alpha + \beta^2$ \& $\gamma + \beta\delta^2$ \\
Val 2 \& $\alpha + \beta^2$ \& $\alpha + \beta^2$ \\
};
\node[circ] (less) at ($(table-2-2)!0.5!(table-2-3)$){$<$};
\node[circ] (equals) at ($(table-2-2)!0.5!(table-3-2)$){$=$};
\node[circ] (question) at ($(table-3-2)!0.5!(table-3-3)$){$?$};
\node[circ, rotate = -90] (greater) at ($(table-2-3)!0.5!(table-3-3)$){$>$};
\end{tikzpicture}
\end{document}