Novu is a filter, Nova is a filter. Both use standardized filter cartridges, they are not proprietary.
From a function perspective they are identical. One is well known in this market, one is not. This makes no difference in function. They are both rated to meet the international plumbing code. These are not complex devices.
If I wanted a filter I would buy the least expensive model from Amazon and place my filter replacements on an Amazon subscription and change them myself.
Here is one of the most expensive ones that I could find:
Robot or human?
link works, Walmart ,$570.00, but there are dozens out there for less than 200.00