Serious question. Is it Windows? iOS? Ubuntu Linux? Which system is the least / most secure? And, while we're at it, are computers more or less secure now than before? Let's look at hard stats (on CVEs) and find out.
The (free) article: https://lunduke.locals.com/post/5467882/which-operating-system-has-the-most-vulnerabilities
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Which Operating System has the Most Vulnerabilities?