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If water is dripping onto the floor of a cabinet below a sink, leaky supply tubes may be the cause. More likely, however, a stop valve or supply-tube connection is the culprit.
To find the source of a leak, shine a bright flashlight into the cabinet and feel the pipes and tubes, stopping to dry your hand every so often. You can also dry the area, place dry newspaper under the suspect plumbing, and watch for spots of water.
A solid chrome-plated copper supply tube looks and feels more stable than a flexible braided tube. But the solid tube is actually more likely to develop a leak because it is inflexible. When bumped a braided tube is less likely to be damaged. Still many people prefer the appearance of a solid tube.