October seems very symfony so I never kept with it after their release.
Statmic if not mistaken is flat file so I didn't bother following up on it.
Pyro has streams or whatever they call them and found them confusing.
check out Coaster. It has a funky modx style of variables and it isn't a bad october/pyro style of system.
Asgard ... I go back and forth on this one. It has a lot going for it but I still think the dev is over complicating things.