I would have to go with '76. The year provides such floaty sound to it and great sounding boards are abundant.
I have yet to hear anything bad from 1976....I really dig Lonesome and a Long Way From Home and it seems like '76 is the only year they play it with a fast steady pace(4/1/76 and 4/3/76 for 22 minute longs versions that shed)....versions from '77 - '78 get spacey.
Even a song I hate as much as 'Knockin on Heavens Door' sound great. Love the reggae twist!
The only down fall of the year is that many great songs starting coming around after it....
Donna sounds like an angel too!