>>411076019
Battery life is actually a bit more. They're a bit cheaper and a bit lighter. Downsides: They're smaller so they occlude easier (worse for hip trackers, not an issue on feet), and people have reported QA issues on some like they'll just not work properly.
They also come with dongles that support multiple trackers per dongle, saving you USB ports; although you can use thsoe dongles with any steamvr tracker like the 2.0s or 3.0.s