Difference between nic salt & opnic

Hi, normally we think nic salt meets our demands, but I hear sth. about opnic being popular, any difference between them?

I googled and here is a brief introduction to opnic:

As the latest Nicotine solution, OPNIC (optimal nicotine) is a type of naturally forming nicotine based on nicotine salt. It improves the vaping experience by providing much more available nicotine with low nicotine concentration. Therefore, it can help smokers to quit smoking in a more pleasant way.

But I could not…

Hi, normally we think nic salt meets our demands, but I hear sth. about opnic being popular, any difference between them?

I googled and here is a brief introduction to opnic:

But I could not…