Hi there!
I will address your question one by one, in the order below:
1 - It is unlikely that both plugins will work together. Because both plugins have the same features, they have a higher probability of compatibility issues and cause errors or strange behaviors.
2 - My plugin also has an "escape code" like the <Show Switch: 12> version to put on choice:
3 - Visustella plugins are obfuscated(kind of an encryption). This means that although this one is free, I can't take a look at the code and see what the compatibility problem is, and try to fix it. Even if it was not obfuscated, there are also their terms of use that depending on the case, could be in the way: http://www.yanfly.moe/wiki/VisuStella_MZ_Terms_of_Use_Article_7
4 - There is a slight chance that I could provide a fix, without the need to take a look at their code. But for that, I will need you to do something: When the error happens, press F8 or F12, and a browser window will open, go to the CONSOLE tab, and send me a screenshot of the error trace that will show there. Depending on what is there, I can try one thing or two.
5 - You could tell me what other things you need from their plugin, and I can see if I have other plugins that can cover that.
