What is the "best" lossless compression format for compression+archive formats?

What is the "best" lossless compression format for compression+archive formats?
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That’s a tough question to answer. Different compression schemes are better at compressing different kinds of data. I generally use BZ2 and I’ve been seeing it steadily increase in usage. BZ2 does produce quite small files but can be slower than other schemes. Decompressing BZ2 seems pretty quick though. Of course, as you have listed, there’s many formats (though I wouldn’t consider B64 or UUE to be compression) so you could always do some benchmarking yourself to answer the question precisely.
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