I'm curious, how often do post-IPO companies give options versus RSUs? I am used to thinking all public companies issue RSUs, but the last one I worked at didn'

I'm curious, how often do post-IPO companies give options versus RSUs? I am used to thinking all public companies issue RSUs, but the last one I worked at didn't. My strike was at a relatively brief high point, and the value declined to about 2/3s of that before the company got acquired, but obviously those options were worthless - they wouldn't have been if they were RSUs.