Quite right. When landing a glider in a field, you have plenty of time. Deciding at 1,500 feet, you have at least 30 to 1 glide ratio, and so about five minutes to plan and decide. No messing around trying to call Mayday, or attempting to restart the engine. So the choice of field can be carefully made according to the rules mentioned above.
But if the donkey stops in a power plane, the field picks you. Might even be a rooftop, or a clump of trees. Main thing, EFATO, DO NOT TRY TO TURN BACK TO THE AIRFIELD. It is the spin off the lousy turn that will spoil your day. Possible to land and survive on nearly any kind of terrain, forest, lake, housing estate if you land with full control of the aircraft, as slowly as possible.
However, using a power line as arrestor cable tends to spoil the approach.