Bouncer with vibration or without?

Reviewers are split. Parents on r/newborns and r/NewParents who have fussy or reflux-prone babies tend to praise battery-powered vibration (the Ingenuity Keep Cozy is the most-cited example). Parents who prefer minimalism — and pediatric-leaning sources — gravitate toward self-powered bouncers like the BabyBjörn or Angelbliss, which rely on the baby's own kicks for natural bouncing motion.