I havent tried either of those, although I did try one of the ghost rings when they first came out.
I found the ghost ring on a pistol to be more of a distraction than a help. They dont work like a true rifle peep, thats close to your eye, and still require you to align the sights, as opposed to shooting through them.
To be fair, I havent tried a set with the dots on them, and they may work better, since you do have a horizontal reference, something mine were lacking.
I guess its just Ive been using the traditional "three dot" night sights so long now, its hard to change. Im so used to them, I dont have to think about them when the gun is presented, and I actually see the dots, before I see a traditional blade and notch sight picture. I have to shift focus to get one, and generally dont do that, until the targets are at 25 yards and beyond.
I have been meaning to give one of the pistol mounted "red dots" a try though, just havent got around to it. Im also afraid Im going to like it, and have to have one on everything I carry after that. A tad to pricey for that right now.
I have been using them on long guns for about 15 years now, with very good results, and I would imagine, once you get them down on a handgun, they would give similar results.
If you really like the ones you listed, if no one else weighs in, maybe you get to be the guinea pig, and you can give us a report.