Perhaps, their proprietary trading platform is something that you can't physically find somewhere else. But that's not surprising because tailor-made platforms are always unique, in very rare cases, they are powered up by the same software developer and look identically. It's not about Ainvesting broker.
It has cared much about devising a solid substitution to renowned software with unique design and great concept.

In other words, you are asking what is unique about Investing.
The first thing that comes to my mind is their custom trading platform.
If it is a custom platform then it is unique... I guess
Also, they have quite a unique regulation authority chosen to obtain a licence from - the Bulgarian Financial Authority or whatever the name is…
However, If you ask what is an advantage of trading with Ainvesting, then I would highlight the range of cryptocurrencies available for trading. It is probably one of the widest ones I have seen lately.