I consider virtual shares (in Germany) an unregulated scam. It’s a “nice to have” but should absolutely not be considered compensation, nor should renumeration be compromised for them. I don’t know a single person who has come out profiting. Dangling carrots.
What are virtual shares exactly? Do you mean you are promised shares before the company goes public?
They aren't shares, but options. So if the company's valuation skyrocket you hit the jackpot, but if the company growth stales you get nothing.
Of course, RSUs are better, but VSOP has a non-zero chance of making you money, it isn't 100% though.