Click here to claim your copy now — and we’ll tell you the name of this Top US Share… free of charge! Warren Buffett is widely considered to be one of the best investors of all time. He has produced consistent market-beating returns over the past seven decades, creating a tremendous amount of wealth for himself and his investors along the way.Buffett’s investment style focuses on buying high-quality businesses at attractive prices. He looks for companies that have a definite competitive advantage, such as a good brand or reputation that have fallen on hard times, which he can snap up at a discount price.5G is here – and shares of this ‘sleeping giant’ could be a great way for you to potentially profit!According to one leading industry firm, the 5G boom could create a global industry worth US$12.3 TRILLION out of thin air…And if you click here we’ll show you something that could be key to unlocking 5G’s full potential…With that in mind, here are two FTSE 100 companies with substantial competitive advantages that currently appear to be on sale.Spirax-Sarco EngineeringRecent trading updates from engineering group Spirax-Sarco Engineering (LSE: SPX) have been disappointing. Global economic uncertainty has caused the company’s customers to take a more cautious approach to capital spending and, as a result, Spirax’s sales have taken a hit.Nevertheless, the company remains a global leader in the production of commercial steam systems. Spirax has been in this business since the 1950s, which gives the company a big competitive advantage over peers. Because steam systems are a critical function, which can be highly dangerous if not managed correctly, Spirax’s reputation is its competitive advantage.Clients are unlikely to go anywhere else just because they can get a better price when safety is paramount. That’s why the company can command profit margins of up to 25%.It’s also cash generative and has a strong balance sheet, two factors which should help the business weather the current global economic slowdown.As such, now could be an excellent time to buy a share of this highly respected engineer. The company’s price-to-earnings (P/E) ratio of 34 might look expensive at first, but this seems to be a fair price to pay for Spirax’s experience, reputation and profitability.Rentokil InitialPest control isn’t a particularly glamorous business, but it’s certainly an essential one, and Rentokil Initial (LSE: RTO) is one of the largest sector groups in the world.The company has been capitalising on its position in the market recently by using its scale to snap up smaller competitors in a highly fragmented market. Earnings per share growth of nearly 100% over the past seven years suggest the group is quite good at following this strategy.The group’s sales could also see a boost from global warming. Rising temperatures have led to an increase in rodent populations, which is good news for an enterprise that has become synonymous with pest control over the past decade or so. This is the company’s primary competitive advantage. Rentokil’s international presence gives it an edge over smaller peers with customers.Looking at the company’s valuation, a P/E of 31 suggests the stock is a bit expensive at current levels. But considering Rentokil’s historical growth rate and market opportunities, the firm’s bright growth outlook appears to justify this valuation. Image source: Getty Images See all posts by Rupert Hargreaves Enter Your Email Address Rupert Hargreaves owns no share mentioned. The Motley Fool UK has no position in any of the shares mentioned. Views expressed on the companies mentioned in this article are those of the writer and therefore may differ from the official recommendations we make in our subscription services such as Share Advisor, Hidden Winners and Pro. Here at The Motley Fool we believe that considering a diverse range of insights makes us better investors. Rupert Hargreaves | Friday, 10th January, 2020 | More on: RTO SPX 2 FTSE 100 stocks I think Warren Buffett would love “This Stock Could Be Like Buying Amazon in 1997” Renowned stock-picker Mark Rogers and his analyst team at The Motley Fool UK have named 6 shares that they believe UK investors should consider buying NOW.So if you’re looking for more stock ideas to try and best position your portfolio today, then it might be a good day for you. Because we’re offering a full 33% off your first year of membership to our flagship share-tipping service, backed by our ‘no quibbles’ 30-day subscription fee refund guarantee. I’m sure you’ll agree that’s quite the statement from Motley Fool Co-Founder Tom Gardner.But since our US analyst team first recommended shares in this unique tech stock back in 2016, the value has soared.What’s more, we firmly believe there’s still plenty of upside in its future. In fact, even throughout the current coronavirus crisis, its performance has been beating Wall St expectations.And right now, we’re giving you a chance to discover exactly what has got our analysts all fired up about this niche industry phenomenon, in our FREE special report, A Top US Share From The Motley Fool. Simply click below to discover how you can take advantage of this. Our 6 ‘Best Buys Now’ Shares I would like to receive emails from you about product information and offers from The Fool and its business partners. Each of these emails will provide a link to unsubscribe from future emails. More information about how The Fool collects, stores, and handles personal data is available in its Privacy Statement.