Better Buy: Illumina, Inc. vs. Thermo Fisher Scientific

It's been a really good year for Thermo Fisher Scientific (NYSE: TMO). The medical and laboratory instrument maker's stock is up nearly 36% so far in 2017, nearly double the increase for the S&P 500 index. But it's been a really great year for Illumina (NASDAQ: ILMN). The gene-sequencing pioneer's launch of a new system has propelled the stock up almost 67% year to date.

Still, Thermo Fisher Scientific remains the much bigger company, with a market cap of close to $77 billion compared to Illumina's market cap of around $31 billion. Bigger isn't necessarily better, though. Which of these successful stocks is the smarter pick for long-term investors? Here's how Illumina and Thermo Fisher Scientific compare. 

Image source: Getty Images.

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Source: Fool.com