Should we search for technosignatures or biosignatures?

Obviously both offer advantages and would revolutionize our view of the cosmos, but an advantage to search for technosignatures is that technology is essentially biology writ large, and has the potential to be more recognizable and more detectable than organic life. Although searching for technosignatures is fraught with the risk of anthropomorphism, we can safely make certain assumptions about how physics works everywhere in the universe, while it's much harder to generalize about life. Does all life require water, air and a temperate climate? Is all life carbon-based? With technosignatures, we can reasonably assume that whatever technologies have been developed by extraterrestrial civilizations, they must at least adhere to the laws of physics.