Hmmm, spotify is helping me here: I guess the following four early albums each have their sprinkling of what I would regard as iconic songs.
"Joan Armatrading" : Down to Zero, Love and Affection, and pretty much everything else ... is a must-have.
"Show Some Emotion": Woncha Come on Home, Opportunity, Willow
"Me Myself I": Me Myself I, Turn Out the Light, All the Way from America
"Walk Under Ladders": The Weakness in Me, No Love, Eating the Bear
I guess a "Best of" album would catch most of those, but I do think this was a time when albums were put together with care, and create a balanced journey, so "All of the Above" must be the right answer!
(And besides being a vocalist and songwriter, she is a mean guitarist).