Much greater

Hi

We’re big believers in sitting around a table together.
Now we have a young son and we try to eat at least two
meals a day together around a shared table. We believe
in food as one of the most important ways we commune
with one another every day. The common ground is much
greater than the differences of opinion.

Does this person mean that the "common ground" is much more important? Or maybe that the common ground is bigger than the differences of opinion?