August is almost here, and I think the S&P/ASX 200 Index (ASX: XJO) is offering several attractive opportunities for long-term investors.
The three ASX 200 stocks below stand out to me because they have strong market positions and several ways to keep growing.
Here is why they are among my top picks for the month ahead.

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Aristocrat Leisure Ltd (ASX: ALL)
Aristocrat is becoming a much broader business than its traditional gaming machine operations may suggest.
The company now creates gaming content across land-based casinos, social casino apps, and regulated online real-money gaming. I think that gives Aristocrat more ways to use its technology, brands, and understanding of player preferences.
Its established gaming operations remain highly valuable. Aristocrat finished the first half with more than 77,200 machines in its North American installed base and an estimated 43% market share.
Those machines can generate recurring revenue while giving the company a large network through which to introduce new games.
I also like the potential for its digital businesses to improve over time. Product Madness can benefit from directing more customer spending through its own channels, while Aristocrat Interactive is expanding its content and online lottery capabilities.
Gaming regulation and changing player preferences are risks to consider, but Aristocrat's content, scale, and distribution make it one of my favourite ASX 200 growth shares.
REA Group Ltd (ASX: REA)
Property decisions usually begin long before someone speaks to an agent or applies for a mortgage. Australians may spend months watching prices, comparing homes, checking estimates, and researching suburbs through realestate.com.au.
I think those repeated visits are incredibly valuable. In fact, almost 13 million Australians use the platform on average each month according to its latest update. That enormous audience encourages agents and developers to advertise where buyers and sellers are already looking, strengthening REA's market position.
The company can then increase revenue through premium listings, seller leads, property data, automated valuations, and financial services.
I particularly like the opportunity to help consumers across more of the property journey rather than only displaying a listing. The ASX 200 stock already owns Mortgage Choice and PropTrack, giving it ways to connect its audience with finance and deeper property information.
As a result, I think REA's audience and data would be extremely difficult for a competitor to recreate, which could make it a great long-term investment.
ResMed Inc. (ASX: RMD)
A third ASX 200 stock I think is a top pick for August is ResMed.
This sleep technology company can begin earning revenue when a patient receives a device, but the relationship does not end there. Patients regularly need masks, replacement parts, monitoring, and support to continue their treatment. I think this ongoing relationship is a key strength of the business.
Masks and other product revenue increased by 15% in the latest quarter, while total revenue rose by 11%. Operating income grew by 17%, showing that ResMed is also turning higher sales into stronger profit growth.
Importantly, the longer-term opportunity remains substantial because sleep apnoea and other breathing disorders are widely underdiagnosed.
I think greater awareness and easier testing could bring more people into treatment, while ResMed's global distribution and connected technology should help it serve those patients over many years.
Overall, I think this means ResMed is well placed to keep growing over the next decade.
Foolish takeaway
Aristocrat, REA, and ResMed have each built advantages that took many years to develop.
I think those positions give them room to earn more from existing customers while continuing to reach new markets and users.
The shares may experience volatility, particularly where valuations reflect strong expectations. With a long holding period, I think all three are excellent ASX 200 stocks to consider buying in August.