IF, IF that CX is a gray label and not a green label CX, then that is the unit I'd choose above these others. The other platforms are all much older except for the Thermaltake RGB Smart series 500w and that unit is merely mediocre.
Better would be a 550w CX gray label unit, but 450w is plenty for an RTX 2060 IF the unit is of decent quality. These other options, are simply not as good. As a distant second, I'd probably take the System power 9 IF I absolutely had to. What country are you in that you are limited to these choices and is it because those are all that is available through local shops and you have to buy through local shops?
Usually there are a broader choices available for most EU countries if you are able to order online. Not always, but often. I'd prefer to see something from Seasonic, EVGA, Antec, Super Flower, newer FSP models or even some of the more recent Be Quiet units than that System power 9. Keep in mind as well, that many of these brands have BOTH good and not very good models, so model is the key deciding factor when it comes to any power supply.