What is the difference between the Elistair Ligh-T V4 and the Elistair Safe-T 2?

The latest iterations of Elistair's drone tethering solutions are the Ligh-T V4 and the Safe-T 2. But which should you choose? The Ligh-T 4 is a more compact solution than the Safe-T 2, but the Safe-T 2 provides a longer micro-tether (125m v 70m) and is compatible with a larger range of drones.