Financially speaking, either place may turn out advantageous depending on your house's price and income. CA (Bay Area) has a lot of other positives that are almost impossible to get in TX - tech scene (quality and quantity), nearby sea, desert AND mountains, good weather are just some of them.
Many years ago, I chose to move to TX as opposed to CA. But most recently, after living abroad for some years, I picked Bay Area to move back to mainly because most of my friends have converged to Bay Area over the years - almost all are in tech. However, if you aren't involved in tech and don't care about some of the other positives of the Bay Area, Austin is almost a no-brainer.