The Advantage360 does not really improve over the Advantage2, in some respects it's a step forward (variable split/tenting), in other respects it's a step back (tiring switches, Bluetooth connectivity issues), and in many respects it's stuck in a 30 year old design (same key wells, same thumb cluster where I can only reach 2 keys per thumb without weird stretches or moving my hand).
The Glove80 is really a step forward in many aspects
better key wells, better thumb cluster, better portability, etc. It's a contoured keyboard that takes all the lessons of the Kinesis Advantage and improves over it.
You missed the original contoured keyboard, Maltron: http://www.maltron.com/store/p20/Maltron_L90_dual_hand_fully_ergonomic_%283D%29_keyboard_-_US_English.html
I have/had a Dactyl, Advantage2, and Advantage360, but the Glove80 is definitely my favorite!