The decision of choosing colour or black and white - if you are shooting film - is a different story than when shooting digital, and requires a different frame of mind, as it is usually made before you leave the house.
But is street photography better in colour or in BW?
There is no right or wrong answer to this question, it is definitely a personal preference. Some photographers only shoot in colour, others prefer BW for all their work. The subject often dictates the choice and that decision is usually made before pressing the shutter.
There are also some strategic reasons to favour BW over colour. As street photographers usually do not remove elements from the frame in post-processing. The real job is to record an authentic moment in time, that never happened before, and will never happen again. A skilful street photographer has to make quick decisions, and is able to remove distracting elements from the frame by moving in closer and positioning him/herself correctly, before pressing the shutter. Most street photographers would not resort to use post-processing tools to remove objects. There are times when bright colourful elements such as stop signs, trash cans, or cars are inevitable, and will draw the attention away from the subject. By removing the colour, you are able to bring the attention back to the human element.
When is colour preferred?
Colours can be an integral part of the story, which also means that a BW conversion would take away the most important component of the image and it may act against the photographer depriving a picture of its sense.
Don’t forget that it’s your vision and you are shooting street photography for yourself first.
Don’t get stuck, try new things! If you always shoot in colour, go out and train yourself to see in greyscale for a few days. If you favour BW, take another look at the world around you and learn to appreciate and use the colours it has to offer. You may discover a whole new way to see, and you will undoubtedly grow in the process.
BW was commonly used by the early classics and masters of the 1950’s. Nowadays, film became expensive, cameras became portable. The digital era made many photographers heading to the street to capture life, no longer bound to heavy equipment which required tripods and longer exposures.
Finally it is the perfect balance and sense of timing with excellent compositional skills that will make great street photographs. It is not easy for a street photographer to shoot in colour, as many may argue BW does show the soul of a photograph, whereas in street photography you are registering the scene and not a portrait.