Clutch type is usually a 2 way or a 1.5 way, that means its active during acceleration and deceleration. It can also chatter at low speeds when making tight turns. Its also tunable in how hard the lockup is and how quickly it can come on, but has to be disassembled to make any changes. Depending on the brand it may require special oil.
Helical type is a 1 way, its only active during acceleration and will only work when both wheels are touching the ground. Has smoother operation when just cruising around. No special oil is required as there are not clutched inside and less frequent oil changes required.