Although it'd be tempting to claim two different states, you could end up regretting it if you do anything that'd be construed as "lying on your application". Personally, I'd claim TX residency- about 1 in 3 people that apply to med school in Texas as residents of the state get in (using TMDSAS), and Baylor College of Medicine (the only TX allo program using AMCAS) has an agreement with the state that TX residents pay the same tuition as if they were attending a state-run medical school.