Having practised the three main colourwork techniques, you’ll realise that each one is more or less suitable for different colourwork patterns.
FAIR ISLE
Fair Isle produces a lot of strands, which can be handy for creating a thick, cosy jumper. But it can be tricky to get the strand tension right, plus they can get easily snagged on toes or fingers (not good for gloves or items meant for babies). Long strands (more than four stitches apart) can be unmanageable, so Fair Isle is best for patterns with colour changes no more than four stitches apart.
Fair Isle is also great for anything that will be lined, such as jackets or luxury throws. That way the strands are safely hidden.