grellas Tankyou for your very insightful detailed explanation.
for readers that don't know what a RSU is
http://www.calstartuplawfirm.com/business-lawyer-blog/restri...
In a nutshell I think the main diference of RSUs is they compensate based on the full value of the stock, whereas NSOs (Nonqualified Stock Options) only compensate on the stock's appreciation in value.