Well, it depends on what your wants are. How long of a commute do you want? What can you afford for rent/mortgage? What activities do you like?
I've been to Miami a few times and NY too many times to count. Depending on where in NY the job will be and where you can afford to live, the commute can either be relatively painless or a couple of hours long. You could spend it in traffic, or on a crowded bus, train, or ferry.
Miami is nice but also a bit expensive if you get anywhere near South Beach. Commuting into the city can also be a bit of a pain if you live outside of it.
I think you'll get better advice if you provide a little more info.
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