really no reason to have both. But I have a LOT of experience with both of these products as well as Blackfire Wet Diamond sealant.
All 3 sealants are VERY similar in most all ways.
BUT, Blackfire and Menzerna Powerlock are both faster to work with. You can pretty much wipe on/ wipe off with both of these products, going panel to panel. And they will both be effective and leave serious protection. Basically you dont have to wait for them to fully haze over. The Blackfire has polycharger advertised and added. IMO, the Menzerna also has polycharger as well, although its not advertised as such. Both of these products are IME identical. Super duper slick with lasting protection. I personally apply to the entire car, NO wait time, and start wiping off where I started. So I make 2 complete circles around the car , from application to removal all completed in 15 to 20 minutes.
The Wolfgang is also a great product. Its a bit easier to spread then both the Blackfire and Wolfgang as it feels a little bit more lubricated when spreading. I like that feature about the Wolfgang. With the Wolfgang you HAVE to let the product fully haze over before removal for ideal protection. Wait time is stated to be atleast 30 minutes, but more ideally 45 minutes. I personally have waited as little as 15 without issue. The Wolfgang while easier to spread, is more difficult to remove than the other 2. But the reality is that its still VERY easy. Just not as easy as the other 2. The other 2 wipe off with zero pressure. With the Wolfgang you have to be sure to check you got it all off.
Slickness is similar between the 3, but I find the Menzerna and Blackfire to be slicker than the wolfgang by a small amount.
Durability is also similar between the 3, but I find the Blackfire to stay slicker and look better longer than the other 2.
For looks, the Wolfgang and Blackfire are at the top. They give a distinct look that is more noticeable than the Menzerna. I'm not sure if that is because the Menzerna being designed as a protection only product after there polishing line when you are done with a full paint correction, or for some other reason. But the Blackfire and Wolfgang have more gloss probably because most customers will apply this to a neglected finish.
Thats really all I can think of.
If you consider price, the Blackfire and Menzerna are 30 dollars, while the WG is 40. Because of this, I do not buy the WG unless its on sale, as I truly think the Blackfire/Menzerna is the superior product and is 10 dollars less.
In summary, the reality is that these 3 sealants "IMO" are all being made by the same manufacturer and you will bascially equal results using either one. Cant go wrong with either of them.