Ha, you think I didn't try the Panasonic? I am Zootopia here
Photos of the Waterpik portable, the Panasonic and this one:
https://photos.app.goo.gl/zWWA14GLJd3imVy78 (I added the two travel shavers just for kicks). Clearly this is smaller, lighter and has the nozzle inside. And I don't mind the USB charging, I already have a pile of devices needing a USB charger, one more doesn't matter especially when it needs to be charged so rarely.