WARNING–long, nit-picky answer ahead!
California vs Texas
California
California is considered a difficult state for pre-meds. It is the single largest producer of med school applicants in the country and its state public med schools are some of the highest ranked in the country. Most of the successful CA med school applicants end up going OOS for med school. (In-state matriculation rate --17.3%; OOS matriculation rate 24.5% Total successful CA applicants–41.8%)
California’s public med schools do not have a strong in-state preference when interviewing/accepting students.
That said the relative percentage of CA applicants who DO end up accepted at a med school is pretty consistent with the national averages (~40%)
BTW, California is not the worst state for pre-meds-- Arizona, Colorado, Maryland, Massachusetts, Virginia and Utah all have much lower instate and overall matriculation rates than California. Florida and Oregon are only marginally better than CA.
Texas
Texas does offer a strong a in-state preference when accepting students. By law at least 90% of the matriculating class at all TX public med schools must be TX residents.
Does this make it easier to get accepted as TX resident?
Actually no, it doesn’t. TX also produces a surplus of applicants–more than can be accommodated in TX med schools. The net acceptance rate for in-state TX med school is actually lower than most other states, including CA. (Instate matriculation rate is 29.9%; OOS matriculation rate 5.2%; total matriculation rate - 35.1%–significantly lower than CA)
Additionally, because TX residents who are offered a in-state slot seldom turn it down due to the low cost of med school tuition in TX, most OOS med schools simply do not interview TX applicants. Why should a school waste an interview slot on a student who in all likelihood not matriculate? (Note the low OOS matriculation rate for TX listed above.)
If you want to move to state where you have the strong chance of matriculating into an in-state med school–try the South–Arkansas (42.8%), Kentucky (48.9%), Louisiana (40.7%), South Carolina (40.6%), West Virginia (52.6%) --or the Midwest–Nebraska (40.5%).
**data is from AAMC FACTS database for the 2019-20 cycle.
** CC-->4 year vs 4 year college**
As noted above there are a still a number of medical school that will not accept CC credits for pre-reqs. Probably around 2 dozen. So going to the CC-->4 year college route is non-ideal. It is possible, but there are additional obstacles faced by students who choose to pursue this pathway.
Additionally students who take the juco route must wait until they have graduated from college before applying to medical school. Adcomms will want to see 2 years of grades from a 4 year college because many view CC grades as being highly inflated and want to see how the student succeeds in the more competitive environment of a 4 year college. This means taking at least one gap year before matriculation. (The opportunity cost of delaying med school matriculation by a year = one year of an attending salary or about $250K)
Students who take pre-reqs at a CC are consider less competitive applicants than those who did their pre-reqs at a 4 year college. In the FAQs of many med schools, you will find that most med school expect those who took pre-reqs at a CC to supplement any CC science/math credits with an equal or greater number of credits taken at 4 year college in the same department. IOW, if you take 4 semester of chemistry at a CC (gen chem, ochem), then you need to take an additional 4 semesters of chemistry at your 4 year college (biochem, advanced biochem, analytic, inorganic, pchem, etc) if you want to be considered a competitive applicant. Ditto for math--if take calc 1 and statistics at a CC, then you need to take 2 additional UL math classes at a 4 year college.
Obviously, the CC--4 year college route will work best for someone who is pursuing a science degree. Taking your science pre-reqs at a CC, then pursuing a non-science major at a 4 year college (and not taking a significant number of UL science/math classes) is an application killer.
**CC GPA vs GPA from a 4 year**
While it is true that AMCAS calculates your GPA based upon all credits you have taken ever, your GPA is broken down and reported on a year by year basis in your application. If your CC GPA is high and your GPA at your 4 year is lower, then the perception is that you are a weak student who couldn't compete with the stronger students and/or more complex material at the 4 year. A downward GPA trend is a guaranteed application killer. (It's an application killer even if you do all 4 years at a 4 year college.)