A AIO cooler is generally quieter (I don't know why the above say different as the pump is near silent) has an edge on performance and looks better imo. At the price of the current AIO solutions air cooling seems a thing of the past.
I'd keep your current cooler as a backup and go for another AIO.
Sorry, but AIO are not generally quieter. At least not in my experience and reviewers in general.
And air coolers are still cheaper than AIO, cool as well or better, cool better at same noise levels, and we don't need a backup coolers in case they fail.
Air coolers are definitely not "a thing of the past." Not even close.