Glo-Toob's are brighter, But I don't like the switch for on/off operations or changing flash patterns.
GloToob is in the process of releasing a rubber "clickie" style switch for the GloToob which should make it much easier to use. Read about it on
this thread over at CPF.
Also, they are releasing a version that uses a 123A lithium battery instead of the small battery currently used. Sounds like about an 8X increase in runtime.
-john