Is Russia's S-300 better than USA's Patriot?

I was once asked in a television interview: "Which anti-aircraft missile system is better: Russia's S-300 or the U.S. Patriot?" A concise answer was needed, and I said that the S-300 was better. Was I right?

If you look at the performance characteristics of the systems, then the answer was correct. In conflicts such as Iran - Iraq, India - Pakistan, where forces were relevantly equal, the answer was correct as well.

However, when it comes to a possible attack of the U.S. or Israel against the "third world" countries, such as Iran, Syria and others, Russia's S-300 will certainly fail. Why?

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