i actually do not know the answer to the question since i really do not have the statistics. but i can answer which anime genre is the least popular to me. i would not likely watch mecha, i know that it is well loved by others but i just don't find any joy in watching this genre. plot in mecha is space invasion rewritten in every possible scenario.
what are your thoughts @ohlnwwlknat
LOL same thoughts, lots of variations but the point is just the same thing. no for mecha animes for me too.