I know better than to get involved in politics and religion. Here goes anyways;
DC is safer
& transmits better
Clicky
As regards 115V being safer... ....everything runs hotter with double current for same power. I can touch either...often have (so much so I can tell the voltage ±15V by the bang of it) I know our receptacles fail much less frequently than those across the pond.
Historically AC dominated because transformers are lower-tech than DC voltage converters. Not so much the case anymore with whole cycle viability.
Skin Effect (current travelling along conductor surface areaonly) is an AC phenomenon, DC is not subject to this.
Skin Affect is only going to exist due to lack of education or engineering know how, I beleive.
Litz wire, negates skin effect. And, you really dont need to have some god awful high MHz range for litz to do its job.
You can use litz in alternators, especially coreless designs to negate copper losses.
There is a really funky alternator design on youtube by YesEnstein , and he used a home made Litz.
There are many types of litz, from home made audio cables, to high speed alternators, and also low speed alternators.
I am experimenting with litz, simply because I am poor. And I found, by tearing down some house appliances such as microwaves, fans etc
I can acquire 0.15 mm magnet wire, and that, I usually tie on end to a nail in the wall, and walk the wire across the room to a hook.
And back and forth at least 25 times. Than I use a drill and twist it all. Now, I have a home made Litz that is very flexible, and very cost effective.