Decanter is better for a gentler aeration, but takes longer.
Basically, this is like an hour in a decanter. In a way, that is. But you get better aeration in a decanter (such as WD’s).
However, I don’t use it on older or higher end wines. The one I received last year as a gift did not include the filter screen, which is well worth it.
They also have a white one that’s supposed to be for white wines. Although not sure what’s so different.