Texas is offering you an enormous amount of money, more than enough to make up for the difference in the USNWR ranking between the schools. It's also been noted that Austin is rather more fun than Ann Arbor (not to mention warmer all year round: no freezing, frozen winters or seasonal affective depression to get in the way of the 1L grades you need).
As for whether or not you wish to work in Texas, by the time you graduate you may not have any
choice. Take a look at these maps showing net migration to Texas:
http://www.economist.com/blogs/freeexch ... /migration
Texas has weathered the recession better than any other state in the union: in fact, they have effectively escaped the recession entirely. Your prospects for employment there in the future are certainly going to be
much better than in Michigan. If indeed Michigan is substantially superior for out-of-state placement (if Texas' numbers aren't primarily the result of self-selection, as I suspect they are), it's because it
has to be.
There's also no reason to delay going to law school for a year, as your earnings after graduation should be substantially more than your earnings before. You only
need to earn money beforehand if you turn down the scholarship money at Texas in favour of Michigan. So that's another strong reason to choose Texas.
However: that having been said, I would base my decision primarily on the difference in culture that you are likely to find between the two schools. While both schools have large entering class sizes, I would be certain that the sheer enormity of Texas is something you can handle. And there's no denying that Michigan has one of the most beautiful law campuses in the United States. These, and the quality of instruction, could make a substantial difference in how much you enjoy attending either school, and enjoying your law school experience is key to excelling at it. I think all of the other factors even out with the edge going to Texas: these final academic and aesthetic considerations should form the basis for your decision.