We are currently on Jira Cloud Free version, but are probably going to change to Standard or Premium in the near future.
What was for you the biggest difference between the Free version and Standard or Premium for you?
I know on the pricing overview, it gives you a high level overview of the differences between each version, but I'm sure there are little (but significant) things not mentioned in this list, like being able to create more levels of work types in the Premium version, etc.