Like the best high-end fitting, underfloor heating is hidden away and out of view, doing away with the clutter of radiators. And, due to the even distribution of heat, it is a fairly efficient way to heat a room.
Because radiators heat up the area immediately around them, this ends up being quickly dispersed upwards, and away from the desired area. On the other hand, a good underfloor heating system will heat a larger area.
This means radiators have to work harder for you to feel the effects, and require the water to be at a higher temperature to work effectively.