1. I would recommend employee status due to the taxation level and complication of return. If you are a contractor, you would have to file as self-employed.
Income earned from the U.S. would be taxable income. I see in United States Income Tax Treaties there is no treaty with Brazil.
If this is a U.S. based company, you will pay taxes to the U.S. and also to Brazil.
2. Easiest for the company - either one is simple for them, cheapest, contractor.
See Taxation of Nonresident Aliens | Internal Revenue Service
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