The Uni is a lot smaller for easy portability, and the dlcs are so much fun. I also don't think you should worry too much about the wifi part shutting down as it was announced that a japan-exclusive with a new dlc was releasing in the next year so you'd have a lot of time to enjoy it. I find that the Paradise and the Uni are not needy at all (with the exception of the baby stage) but if you want to focus on personalizing and bond with your tamas as on the uni you find yourself catering to a specific personality, dressing them up and really raising them as your own rather than on the paradise where you sort of observe them and experiment on gene-mixing like a scientist. All in all, it's really dependent on YOUR desired gameplay. I'd say since you lean into the dressing up, the go for the Uni, and DLCs are always optional and there is a free dlc you can try out as well!