For years, has been the top dog. But, as they say, the times are a-changin'.

iPhones are old news. Unit sales of the devices have leveled off after years of growth. What's more, the company is now embroiled in an antitrust case with the U.S. Department of Justice that could last years and cost millions -- or billions -- in legal costs and fines.

The time may finally be here for investors to look elsewhere for outperformance. Let's have a look at two artificial intelligence (AI) stocks that could be suitable portfolio replacements for Apple.

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Source Fool.com