Funny forum to choose for this, but I happen to know the answer. Depends on what you want to do. A good general rule is go T14 if you can get in, otherwise take a full ride from a lesser school if you get one. No money and not a top school? May want to consider a different career path.
Next consideration - Staying in Miami (or Florida)? Then UM is fine. Still will need to finish top 25% at least to get a good job.
Finally - tax. UF is a better school for tax than UM, but Georgetown and NYU are the two schools really known for tax law. If you are really set on tax, you can do an LLM at NYU or Georgetown after the JD. Note that you will not get paid more for having the LLM, but it is a quasi-prerequisite to getting jobs at the major law firms in NYC, etc. (unless you have a T14 degree, then the LLM isn't necessary).
Good luck.