I think all of these products are based on the same basic enzyme formula. The only difference to me seems to be the scent. Some just smell better. I didn't care for Simple Solutions smell. It was like a mens room or something.
In all cases, you really have to saturate the area. It's better when the accident happens close to the edge of the carpet. Then, you can pull it up, and soak the padding as well.
In my previous place, I realized pretty late that one of my cats was hitting this one spot often. Luckily, it was in a corner, so I could pull up the carpet, and actually replace the padding. Then, I saturated the carpet with an enzyme cleaner and let it dry, followed by the Stemvac junior. I did that about 3 times!
Finally, I put some plastic sheeting between the padding and the carpet before I tacked the carpet back down, just in case the little bastard were to go there again. But, he never did. (I went back to the old litter box, and he was happy.)