 Tantalum caps are known for their stability, high values in small package volumes, and the fact that they are definitely polarized, and will in fact explode if connected incorrectly. Trust me. Plus they cost considerably more than regular electrolytics, so to handle with care. Then there's the wide variety of film capacitors, which are thankfully not polarized, including the go-to general purpose polyester, aka mylar film cap. These are relatively stable and have a high capacitance for their size, but their performance degrades at higher temperatures. Finally, there's the polypropylene film capacitor, known for its reliable performance and precision. These are at home in high power and high frequency applications, but they're more sensitive to heat than their siblings.