https://www.alpinestars.com/tech-air...-airbag-system
The tech-air vest costs twice as much as the Helite Turtle vest, and also requires a compatible jacket because it is worn inside the jacket rather than outside it, so the total cost is much higher than a Helite vest.
I'll stick with my Helite vest. My main purpose is using it to defend against the possibility of hitting a deer. I would also be useful if a lane-changer knocked me off the bike and some other types of collisions. I've got the Hi-Viz version so it helps with conspicuity. As with all protective gear, I am under no illusion that these will make me invulnerable out on the mean streets.