The SR22 is a good aircraft but in my opinion the G1000 system far surpasses the Integra.
Personally there are two features of the Avidyne system which would make me choose it over the other:
1) If it fails, you still have an autopilot
2) If it fails, you still have GPS and a radio
From what I understand, a G1000 failure results in loss of the integrated autopilot and also the integrated radio.
Edited to say - just realised this is my first post on here although some of you will know me from other fora. Hello Pprune