Hi, thanks for pointing out these products.
At first, Arvid is a hobby project, something you can build at home. Next, it produces TV signal, not VGA signal, so you can hook it to 'old' CRT TV. As far as I can see the cards you mentioned don't have TV output (maybe I'm wrong). Also it is external, so you can use it with your laptop or mini pc where you can not plug-in standard video card.