Since you mentioned redundancy, here's a drawing I did a while back trying to explain to people how dual satellite recievers weren't as good as dual receivers..  Throughout the years my setup evolved, eventually settling on setup 5 as the best possible solution I could come up with.  It has the least number of single points of failure possible (0) and the highest redundancy.  Mainly I wanted to show what single points of failure were since it seems like a lot of people didn't understand that one the forums.  Of course other things come into play like budget, space in the airplane, radios ability to run dual rx, etc...  I know you didnt ask but I thought it might be a good place to post this pic, hope you don't mind.