Probably depends on which part of the world you live in. There are a few interesting wikipedia articles about that.
Until the late seventies, there where those German kind of flat (semicircular) symbols I tend to use. The British and the Americans used symbols, which had fancy corners and were a bit "bulky". Those a very popular in the old handdrawn schematics of "ancient" devices. Then the IEC came up with the boxes, which could be plotted faster, than circular shapes, and had a myriad of possibilities for every kind of circuit you ever could imagine. Those symbols are really complex.
Obviously the English speaking world mainly ignores them and goes on to use the old symbols, where as the Germans more or less use the IEC-boxes. And the other European countries or Asia? Well, I don't know, never saw another kind of symbols. Probably they all use one of the three systems.
I hope, that's not totally wrong
Maybe somebody in the forum knows more about the topic? Tell us...