It has been a good period for owners of PLS Group Ltd (ASX: PLS) and Rio Tinto Ltd (ASX: RIO) shares, with both trading near record highs.
This strength reflects improving sentiment across commodities and growing confidence in long-term demand for materials linked to electrification and global economic growth.
With that backdrop, is it better to own a diversified mining giant with exposure across multiple commodities, or a focused lithium producer with direct leverage to one of the most important trends in energy?
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PLS: A pure-play on lithium demand
PLS offers a clear and direct exposure to lithium.
Its Pilgangoora operation is one of the largest hard-rock lithium assets globally, and the company has built scale alongside a strong balance sheet and operational discipline.
In its latest results, the business reported a 47% increase in revenue to $624 million and a significant lift in margins, supported by higher realised prices and strong execution.
What stood out to me most is the operating leverage. When lithium prices strengthen, that tends to flow through quickly to earnings. That creates the potential for strong upside during favourable market conditions.
There are also broader themes supporting demand. The ongoing energy transition continues to drive interest in electric vehicles and battery storage. And with war in the Middle East influencing fuel markets, there is increasing attention on energy security and alternative solutions, which could support lithium demand over time.
For investors who want direct exposure to that theme, PLS offers a clean and focused way to access it.
Rio Tinto: Scale, diversification, and consistency
Rio Tinto brings a very different profile.
It operates across iron ore, copper, aluminium, and lithium, with a global portfolio of tier-one assets. That diversification creates multiple sources of earnings and reduces reliance on any single commodity.
The scale of the business is also significant. In its FY25 results, Rio Tinto delivered underlying EBITDA of US$25.4 billion, supported by strong production across key commodities and continued operational discipline.
The company has a long track record of returning capital to shareholders, with dividends paid at the top end of its payout range over the past decade. And its latest result continued this trend.
There is also a clear pathway for growth. Rio Tinto continues to invest in copper and lithium projects, alongside its core iron ore operations. Its pipeline includes developments that could support production growth over the coming years, while maintaining a strong balance sheet and disciplined capital allocation.
For me, this is a business that combines scale with adaptability.
Valuation
Based on CommSec consensus estimates, PLS shares are trading on around 16 times FY27 earnings, while Rio Tinto shares sit closer to 19 times FY27 earnings.
Although this suggests that PLS shares are better value, it is worth remembering that Rio Tinto usually trades at a premium. This reflects its scale, diversified earnings base, and long track record of delivering through different commodity cycles.
And for me, that premium feels justified.
Rio Tinto provides exposure to iron ore, copper, aluminium, and lithium, alongside a pipeline of projects that can support future growth. It also generates significant cash flow and continues to return capital to shareholders over time.
PLS has the potential to deliver stronger returns in a favourable lithium environment, but its single-commodity exposure means it lacks diversification and could be deemed higher risk.
As a result, I would lean toward Rio Tinto as the better buy today due to its broader exposure and more consistent earnings profile.
Foolish takeaway
Both companies are benefiting from strong commodity demand and are executing well.
PLS offers a focused way to gain exposure to lithium and the energy transition, with the potential for strong upside when conditions are supportive. Rio Tinto brings scale, diversification, and a long history of delivering returns across cycles.
For me, Rio Tinto shares stand out as the better buy right now, supported by its broader earnings base and ability to perform across different market environments.
