As a long time Sonny fan, I just gotta throw my two cents worth in here. I love "The Bridge", "What's New" (an overlooked masterpiece, IMO. The long "If Ever I Would Leave You" is priceless), "Sonny Meets Hawk", "On Impulse", and "Alfie" (again, overlooked - Sonny plays his ass off).
A lot of people point to "Our Man In Jazz", but I think it's just a little too rambling. "Now's the Time" & ""Standard" are OK, but seem too edited for airplay, and don't flow particularly.
I loved his first "comeback" album on Milestone, but it's been downhill ever since. I finally gave up on his records by the mid 1980's, although they weren't as lame as a couple of out-and-out commercial titles he spewed out in the mid 70's.