Dxp4800 plus vs Dxp4800GT

I have a question , I’m starting to get a ugreen NAS but I’m total beginner but also trying to future proof where I don’t have to buy another hardware for limited space.

One on hand there is a good sale for dxp4800GT for $527 but the Plus at $619 and the main reason I’m mostly using this is for storage family and videos and not really into 4k videos due to file size.

Which should be the better buy ? Money is also a bit limited but don’t have a much reason if need to spend a bit more as long that it good.