Sandisk (NASDAQ:SNDK) and SK hynix (NASDAQ:SKHY) are both major players in the memory market, but they are exposed to different parts of the cycle. Sandisk is primarily a NAND flash business, supplying storage used across consumer, enterprise and data-center applications. SK hynix has a much larger exposure to DRAM and high-bandwidth memory (HBM), putting it at the center of the AI infrastructure boom.

That makes the two stocks an interesting comparison. Both are benefiting from constrained supply and strong pricing, but both also face questions about how long the current environment can last. New capacity is being planned across the industry, while memory prices have started to show signs of moderation. For investors, the key issue is what today’s exceptional margins look like once the cycle becomes less favorable.

Investor Louis Gerard has revisited the two investment cases following a series of important developments.

For Sandisk, one of the biggest changes is its commitment, alongside Kioxia, to more than $31 billion of investment in Japan through 2032. That includes an $11.3 billion new fab at Kitakami, with production expected to begin in fiscal 2029 or later. Sandisk is required to fund around half of the joint venture’s capital spending when the venture’s own cash flow is insufficient.

The timing is important. Sandisk’s current earnings are being supported by exceptionally strong NAND pricing, but Gerard points to signs that this is already starting to moderate. TrendForce expects contract-price increases to slow substantially from the huge gains seen earlier in the year. Sandisk has also seen consumer revenue fall sharply as prices rose, while data-center revenue surged. At the same time, management expects bit growth to come in below its historical range as customers work through higher inventories.

Gerard also questions how much the company’s reported free cash flow says about the underlying economics. Sandisk’s fabs are operated through joint ventures, meaning much of the capital investment does not appear as conventional CapEx on its books. The company nevertheless retains contractual obligations to help fund that investment. The result is a business that can look unusually cash-generative on headline metrics while carrying substantial future capital commitments. “Valuation metrics appear attractive, but FCF yield and ROIC are overstated due to JV accounting and off-balance-sheet capital intensity,” the investor summed up.

Accordingly, Gerard rates SNDK stock a Sell. (To watch Gerard’s track record, click here)

SK hynix presents a different setup. The company has committed roughly 40 trillion won to a major share buyback and raised its shareholder-return target to more than 50% of cumulative free cash flow. Gerard also points to the company’s large net-cash position, which provides substantial financial flexibility through a memory downturn.

Meanwhile, the company generated record quarterly operating profit of 60.5 trillion won in Q2, while its HBM business remains at the center of the AI opportunity. SK hynix began mass shipments of HBM4 in the second quarter and says its combination of performance, power efficiency, yields and cost competitiveness gives it a strong position as the market moves to the next generation.

There are still important risks. SK hynix remains exposed to memory-price volatility, customer concentration and the HBM cycle. Chinese producer CXMT is also expanding its DRAM capacity, potentially putting pressure on commodity memory prices. SK hynix’s proposed U.S. manufacturing plans could require significant capital, while its ADRs trade at a substantial premium to the Korean-listed shares. Its HBM lead also cannot simply be taken for granted, with Samsung having narrowed the market-share gap during the second quarter.

At the same time, the valuation is appealing. SK hynix trades on a single-digit earnings multiple despite its position in HBM and its strong cash generation. The forward P/E is around 7, while the forward free-cash-flow yield is roughly 10.7%. That means investors are paying relatively little for a business generating substantial cash at a time when AI-related demand remains strong. The valuation also looks modest compared with other semiconductor names, particularly given SK hynix’s exposure to the HBM market.

All that, says the investor, makes SKHY a Buy.

Wall Street’s analysts see no reason to pick between the pair, with both claiming Strong Buy consensus ratings. SNDK’s average price target stands at $2,195.29, suggesting shares will gain 23% over the coming months. SKHY is expected to climb 37%, given the average target clocks in at $254.70. (See SNDK stock forecast or SKHY stock forecast)