Way more common in Europe to do winch launches. There are pros and cons. The winch launch can't get as much altitude as aerotow, so the odds of the flight being a "sled ride" without finding lift to keep the glider aloft are much higher. Glider operations in the US tend to be from regular airports, where there are already facilities for powered airplanes to do the tows. The winches also take more labor to operate, so they are a bit more practical at glider clubs in Europe where the field is pretty much dedicated to glider operations anyway.
Aerotow lets the tow pilot put the glider in lift when it releases, which is preferred. In the US, there generally is no shortage of power pilots that can do the towing. And the operating costs of a towplane are much lower.