Both photographers were highlighted as good examples of candid portraits. They do, however have very different approaches. Andreas has a very macro style, often without people. His images are generally colour and feature macro patterns in buildings, people or nature. When people feature, they aren’t recognisable or aware of the image being taken, however the people do seem to be individuals as the choice of background or timing makes them clearly distinguishable. I assume that this may also be due to the use of a wide Depth of Field. A good example is the following image of a swimming pool, where the people seem to be spread evenly, right across the macro viewpoint. Clear, light backgrounds and wide depth of field ensure each individual stands out.
On a personal note, I really enjoyed the images of Andreas Gursky as through his macro approach he adds a sense of abstract to the images he creates.
Henri Cartier-Bresson has a different style, with clearly recognisable individuals, sometimes staged images, but often candid. Using Black and White and careful use and placement of backgrounds, the subjects of his images are very clearly the people. He uses the contrast in the black and white images well to draw out the people. Often they appear as silhouettes.
The following is a really good example of one of his candid images that highlights the features described above.