Long-term investors must think differently when evaluating stocks. Looking decades ahead is as much about preventing unnecessary risks and losses as it is about maximizing upside. Ideally, these investors strike a compromise somewhere in the middle.

Finding a middle ground is going to be your best bet when it comes to artificial intelligence (AI) stocks. Are you looking to ride AI to big-time portfolio gains over the coming decades? Your search should focus on the best long-term AI stocks. The best choices in this sector could be a few obscure companies no one is discussing ... or they could be some obvious AI champions that have proven ability to be winners. It's all a matter of what went into creating your investing thesis.

Here are three reasons why Microsoft (NASDAQ: MSFT), Amazon (NASDAQ: AMZN), and (NASDAQ: GOOG) (NASDAQ: GOOGL) could be the best long-term AI stocks money can buy.

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Source Fool.com