The key is not to get yourself in a situation where inadvertent IMC becomes a possibility in the first place. It should almost always be avoidable in recreational flying. If it looks unavoidable, a precautionary landing would be advisable.
If inadvertent IMC does occur, I believe that the best course of action for a non IMCR/IR pilot is the 180* level turn. For a pilot and aircraft capable of instrument flight it is my opinion that climbing to safety altitude is generally the safest option. If there is hilly terrain in the area, maneouvring laterally could be the least safe option. A zoom climb to stabilize at the best angle of climb speed will get you away from the ground with the least risk of hitting something solid. How well would a right 180* turn have gone in the video above? Just my opinion.