Events + or BuddyPress Group Calendar?

I am looking at the Events + plugin and the BuddyPress Group Calendar plugin and trying to decide which to use. I have BuddyPress with a mulitisite and BP Groupblogs setup. I want events to be able to flow between sites yet be able to control them per group/site. Which of these plugins will work best for this? What are even the major differences?

Thanks for any info!