Switzerland doesn’t have capital gains tax except for professional stock traders. So there wouldn’t be any tax on the gain after vesting. But yeah it’s a gamble on the stock price that’s for sure.

Basically I concur what searedsteak wrote. Would add that stock grant in the company is in number of shares and is paid out over 4 years. So, I really like low stock prices when they vest (taxable event), while capital gains is 0 for non professional investors. So, unless you intended to sell stock right out there’s no difference and only gain. I never sell shares of my company.