
Two popular stocks among tech investors lately are Rigetti Computing (NASDAQ: RGTI), which makes quantum computing hardware and software, and the semiconductor company Nvidia (NASDAQ: NVDA). While Nvidia is a much more direct bet on the booming artificial intelligence (AI) market, Rigetti’s quantum computing systems are integrated into some existing AI.
Both stocks have soared, too, with Rigetti up 34% and Nvidia skyrocketing 342% over the past three years, compared to the S&P 500‘s 15% rise. But, which is the better AI stock for long-term investors? Let’s take a look.
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If you’re in the market for an AI stock, it’s hard to beat Nvidia. All major global tech companies have ramped up their data center spending over the past few years as they compete for artificial intelligence dominance.
That’s led to a bonanza of data center spending and rising demand for the processors in them. The result has been a boon for Nvidia’s chip sales. Revenue from its data center segment soared 142% in fiscal 2025 to $115 billion, and the company’s non-GAAP earnings soared 130% to $2.99 per share.
It’s also given Nvidia a massive lead in the AI data center processing space, with an estimated 70% to 95% market share. And the AI boom isn’t over yet. Nvidia CEO Jensen Huang thinks tech companies will invest $2 trillion in AI data center spending over the next few years, which could lead to even more demand for Nvidia’s advanced processors.
The company is well-positioned to benefit from its latest AI processor, Blackwell, which has already spurred strong demand from tech giants and resulted in $11 billion in sales, the company’s “fastest product ramp.”
Quantum computing offers investors a compelling opportunity because the ramifications of the technology could advance everything from materials science to disease prevention and climate science. Unlike traditional computers, which process bits as either 0s or 1s, quantum computers use qubits, which can be either 0 or 1, or both simultaneously.
That allows them to scale hypothetical scenarios much faster than traditional computers, although sometimes at the cost of making more mistakes. Rigetti makes hardware, software, and quantum cloud computing systems that tap into the massive potential of this market, which could be worth $170 billion by 2040.