RSUs and options are very different. RSUs are shares that the company gives to you, and for a public company you can sell them almost immediately to convert them to real cash. Their value fluctuates as does the company’s stock, but it is still real income. The rational thing to do is usually to sell all or most of the shares as soon as they vest and not to gamble on future returns.

Options at startups are basically worth nothing, unless/until the company becomes a breakout success. Even then you generally can’t sell them unless there is an IPO or you do a second market deal. These really are a lot like a lottery ticket.

I won’t get into all the ways options can be worthless even if the company does well enough to IPO, and you actually managed to exercise / keep the shares you vested.

Also, some later stage non-public startups issue RSUs instead of options. These too are closer to a lottery ticket.