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Mandarin is undoubtedly way more useful than Cantonese. Cantonese is a local dialect and it's really only useful if you are living in Hong Kong, Macau, Guangzhou or dealing with some overseas Cantonese communities. Mandarin is the national language of China.
Anyways, to answer OP's question. I have learned phrases of Tagalog, Vietnamese, Thai, but obviously not learned anything in depth.
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