Powered subwoofers are a popular choice because they do not require the purchase of a separate amp. But you are not obliged to choose them over the passive subwoofers.  Powered subwoofers usually have smaller drivers thus they are slightly less powerful than passive subwoofers which depend on external drivers to function.  However, if you prioritize compactness and cost-effectiveness, purchase a powered subwoofer. They are also easier to install and are very convenient mainly because they work by simple ‘plug and play’. But, if you would want to make a distinctive choice for both your subwoofer and amplifier, then purchase a passive subwoofer instead.