Answer
$ClO^-$ is the stronger base.
Work Step by Step
Stronger acids have weaker conjugate bases, so, we can compare the strength of the conjugate acids of these bases:
$HF$ and $HClO$:
$HF$ has a higher Ka* value, therefore it is the stronger acid, and $F^-$ is the weaker base.
If $F^-$ is the weaker, $ClO^-$ is the stronger base.
*Check the second appendix of this book.
