RSUs - way more liquid than options, they're practically cash in the bank when they vest, but watch out for cliffs (i.e. vesting schedule). Amazon is particularly bad (tail weighted), Google is particularly generous (every month).
Well sure, if you don't have enough to add up to a share every month then you won't get a share every month. If the price continues to rise and there's no stock split that will probably become more likely in the future.
