Answer
$m \angle UST$ > $m \angle VST$
Work Step by Step
According to the Hinge Theorem, if two consecutive sides of a triangle are congruent to two consecutive sides in another triangle, but their included angles are not congruent, then the side that is opposite to the larger included angle is longer than the side that is opposite the smaller included angle.
$TU$ in $\triangle STU$ is $14$ whereas $TV$ in $\triangle STV$ is only $12$; therefore, $TU$ is the longer side, and the angle opposite to it will be the larger angle.
$m \angle UST$ > $m \angle VST$