hegz
I'm leaning heavily towards Anderson. The U$40k makes UCLA's ROI a little bit more appealing than Mccombs.
As for the cities, after a lot of research LA seems more attractive in terms of opportunities and convenience. Also, I gave a very good friend already living there with his wife.
The challenge now is to "convince" my fiance about the city, any tips? (that's a hard one

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Again, thank you all for the support.
I am surprised she would need selling on LA - perhaps a visit would help you two to come to an agreement and a sense of peace (if that's in the cards in the next few weeks). You can go hang out in Santa Monica, Third Street, Brentwood, Century City, and Venice maybe. You can also have a quick side trip to Vegas. She will be sold

Having a very good friend in LA will help get you settled and will give her someone to hang out with. It will be more challenging for your fiance than for you since she will be with nothing to do and no friends at first. She will be stuck with doing all the support work (shopping, cleaning, dealing with a driver's license, etc). If she does not drive, get her to take some classes/driving lessons in Brazil. US is much easier to drive than any other foreign country - roads are good, rules are clear, and signage in LA is fantastic. Very easy to drive but you need some experience and confidence to get going. Things will get better after about 9 months but the first 6 will be toughest as you go through culture shock, readjustment, and dealing with annoyances of Texas or California lifestyle.
If you choose not to get a car at first, in either Austin or Los Angeles, make sure you are walking distance to a grocery store. There is no public transportation to speak of and and it is pain to haul your groceries by bus or Uber. She will also feel less trapped and stuck and have an easier adjustment if she can easily get out and run errands or just take a walk in a nice area. I have a few married MBA friends and their wives all had rough time transitioning because the brilliant MBA husbands just did not think about things from wife's perspective in the midst of all the excitement.
P.S. If she is a Fiance, and not your spouse, would it be an issue for getting a visa or having her in the country? Also, if you are planning to get married while you are in BSchool, make sure you allow enough time for her to get a new passport with the new name and then get a new US visa - you would need to research how to best handle this if she needs one that is.