Differences between Tamagotchi Nano series, and Nano/Chibi/Depa types

Is there a difference between the Tamagotchi Nano series 1-4, besides the series 4 having a different evolution chart?

Theres also two more Tamagotchi nano variations that seem to be called 'depa's, rather than 'series 1/2/3/4', is there a difference between the 'depa' tama's and the nano series?

And one last thing, which is better, the Nano, or the chibi?

Reference for the tamagotchi nano variations:

https://php.scripts.psu.edu/dmh5086/t/nano.php

The Depa ones are just shell designs of the 4th wave ones that were exclusive to the Japanese Tamadepa stores actually.

Other than the evolution chart, there's pretty much no difference inside the waves. Waves 1-3 only had different shell designs. Wave 4 introduced some new characters with new shell designs and I think that was it.

The nano is better than the Chibi I think. If I remember there's a little game on the nano that the Chibi doesnt have. The Chibi only has feeding and medicine as available features while the nano has bigger sprites, feeding, a game and medicine.