God Bless the manga artist Adachi, who has such a cute artstyle, and his absolute love for sports, especially baseball. Because he has had multiple of his mangas made into animes, you can actually see how, with the same base character designs, anime changed over the years.

Same thing being animated, different techniques… this is as controlled an experiment as you can get.

I personally think H2, the earlier series, looks better animated, however both aren’t BAD by any means.