Opinion: Both will work equally well. Rebar is easier to install and requires less attention. Better chance of getting a proper installation. Pay extra and get a good rebar slab.
Soil conditions also play a part in the decision of rebar vs post-tension. The post-tension slabs tend to hold up in North Texas a little better especially where clay is present due to shifting.
Rebar is king. Too many variables for post tension. Crappy contractors who build homes/developments don't really give a crap. Don't use fly ash in the mix either. It's cheaper, but not as good as regular ol cement.