For all readers, arithmetic codes are better in nearly all ways. They can be implemented in less RAM and code, they compress and decompress to a better ratio, and the probabilities of different symbols appearing can be dynamically updated during the stream far more easily.
The only reason Huffman codes are used is they were invented first and arithmetic codes were patented. That patent has now expired, so we should use the better design.
The only reason Huffman codes are used is they were invented first and arithmetic codes were patented. That patent has now expired, so we should use the better design.