If you only have time to visit one of the baths, I would recommend Szechenyi. It’s the biggest thermal bath in Budapest and one of the biggest in Europe. It will provide a more complete bath-experience. Each bath has its own unique character and both are very popular in the city. Here is some more info to help you decide: Szechenyi Baths, Gellert Baths
Let me know if you had any other questions.
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