Texas to Guadalajara

I have posted several questions about an upcoming surf trip from Texas to
the area north of Puerta Vallarta. In light of the advice we have received,
we have decided to drive from Texas to Guadalajara by way of San Luis Potosi
and then from Guad to PV (this is the way to stay on toll roads, which I
understand is a good thing). From Texas, we have the option of crossing at
Nuevo Laredo or Matamoras. One person has recommended crossing at Matamoras
and then taking toll roads to San Luis Potosi. Does anybody have experience
driving either of these routes? Is one better than the other? We are
leaning toward Matamoras because we are picking up a passenger in Corpus
Christi and because we presume it will be less crowded and hence easier to
cross the border there. Any thoughts?