In general, we recommend most people try a semi-rigid arch support before trying anything else. Semi-rigid supports provide a good mix of firm support for the arch of the foot without being too stiff for most uses.
If you’ve tried a semi-rigid support and still need more support, or if you’re looking for maximum arch support, a rigid support insole would be our recommendation. Conversely, if you’ve tried a semi-rigid support and need less support, or if you’re only looking for light support, a flexible arch support would be our recommendation.