But one company, at this moment in time, can claim they're worth just a bit more than the other, as Microsoft briefly surpassed Apple to become the most valuable company in the United States. For now though, Microsoft is doing a little better than Apple.
And now it is close to surpassing Apple as the world's most valuable publicly traded company. In other words, Microsoft may have (temporarily) won by default.
Near 1800 GMT (2 a.m. Tuesday in Manila), Microsoft hit an overall market capitalization of $812.9 billion, just ahead of Apple's $812.6 billion, according to Bloomberg News.
Apple has been the world's most prosperous firm since claiming the top spot from Exxon Mobil earlier this decade.
After peaking in market cap at the highs of the dot.com bubble in 2000, MSFT began a slow drift lower in size before finally putting in a bottom at the lows of the financial crisis. The two companies quickly traded positions again in early trading Tuesday.
Daniel Ives, an analyst with Wedbush, tells CNN Business that Microsoft has "almost been Teflon-like".
Amid a cloudy outlook for hardware sales, Apple has said it will step up focus on services business. Since then, Microsoft has moved away from Windows software as an engine of revenue growth in favor of enterprise software, particularly cloud services like Azure. The company was the top cloud services provider for enterprises a year ago, ahead of Amazon, IBM and Google.
Being less reliant on consumer demand helped shield Microsoft from holiday season turbulence and U.S.
Now Apple became the first ever trillion d=dollar company ever known to the technological history of mankind.
The dip in Apple stock came after Donald Trump hinted towards placing more tariffs on Apple products such as iPhones and iPads which are being manufactured in China.
Apple has fallen about 23% since the end of the third quarter. The latter has seen its market value fall as much as 40% from its peak in July as investors worry about the long-term privacy backlash. That's partly because with fewer innovations from previous models, more people choose to hold on to the devices for longer periods before upgrading.
Google and Facebook are increasingly in the crosshairs of regulators over data privacy. Unlike Netflix, it's not on a hunt for a diminishing number of worldwide subscribers.