Didn't have many good cirno images, so I had to go hunting. Enjoy some of my favorite artists.
>>2500535Memories of Phantasm and Summer Day's Dream are both pretty well done. Dream seems to have a more original story (pardon me if I'm retarded, I don't follow the story for the games/books very closely) whereas Memories seems to just follow the games. Memories covers a lot more characters, though -- Cirno doesn't show up in Dream at all, so far I think it's only been select characters from 6, 7, and 8, plus Suika and Aya.
Overall I think Dream is better, but it's also releasing even more slowly.
I haven't watched any of the others.