Can't say for the big twin, but for the 737 the sideslip (wing low) method is actually one of the boeing approved methods, up to a crosswind component of 17 kts at flaps 15, 20 kts at flaps 30 and 23kts at flaps 40.
Two other techniques are described, one being touchdown in full crab, which is approved up to the 40kts crosswind limit, but not recommended on dry runways, however is recommended on wet or slippery runways. The other one is the overall recommended technique of de-crab during flare.
The fail operational autoland uses a mix of wing low (up to 7° of bank if memory serves right) and crab.