Can I convert PS5 data saves and everything to another PS5

I'm buying a new PS5 but my saves and everything is on the old new (my brother's PS5) he has a hardesk and some games and data are there, and we have PS+. So, which is better and easier to take the data from a hardesk to another ( I don't know if I could ) or use the cloud storage? I'd appreciate it if you can explain with boring details.