The short answer
These solve different night-time problems. The Graco Eluma Nest listens for crying and responds with rocking, vibration and sound, working through five soothing sequences. The Chicco Next2Me Armonia has no motion or sound at all: its only tech is a motion-sensor night light that comes on as you reach over, so you can manage a feed or nappy change without the big light.
The Armonia is the better bedside crib. It fixes to your bed with a harness and sliding system, and 11 heights suit beds from 58cm to 70cm high. The Eluma Nest is fixed-height with no drop-down side, so it stands beside your bed and may sit too high for some. But soothing is what you're paying a smart crib for, which is why the Eluma Nest wins clearly on the scorecard. Both are listed as meeting the bedside crib standard (EN 1130:2019), both last to about six months or 9kg, at around £200 and £179.
My call: the Eluma Nest if you want a crib that has a go at resettling your baby before you do. If arm's-reach night feeds matter more, buy the Armonia and a separate white noise machine, kept well away from the crib.