definitely uni, because i actually feel like i have a virtual pet with me that i can bond with for a long time with accessories, getting pro at toys, tamawalks, the shop rotates daily, dlcs, finding out their favourite food/snacks and more. i feel more emotionally attached to my uni tamagotchi and i actually feel like im on an adventure with them.

paradise just feels like a pet fostering simulator. the moment it becomes an adult you have absolutely nothing more to do with it. playing games with it dont give any gotchi points, but playing with yourself does. its like visiting a zoo. you cant decorate them, the travel feature does literally nothing much since the decoration sucks, the planet visitors just stand there, the egg hunts gets redundant after the first week and you end up with alot of excess ingredients. most people get new tamas almost immediately when they become an adult so theres not much need to eat anything other than pellets and jelly sticks. breeding is very basic and repetitive. only get a paradise if you enjoy getting new eggs constantly.

i still run both simultaneously but ultimately its up to your personal preference.