I have circle grass. It never really made much of a difference to me though. But I did get to see how my grass looks when it snows and it has a star shape, which is really pretty!
I think a lot of people really wanted the star shape snow.
My favorites are:
Triangle grass - I like how small it is compared to the other shapes, so it's a less noticeable pattern, and the triangles remind me of blades of grass.
Circle snow - The circles remind me of piles of snow, of snowballs, and so on. Circles just make sense to me with snow.
Star snow - Stars are really fun and festive and remind me of the holiday season, of snowflakes, and sparkly snow.
It's too bad my favorite grass shape doesn't come with my favorite snow shapes, ah well.
I have circle grass and never knew it came any other way until I got another copy of the game. I'm happy to know that in winter it will make star snow, tho, so I guess I got lucky!
My first town had circle grass, which is my favorite, and the next one had square, which is my second favorite. I would rather have circle, but I like square too.
Triangle grass is okay, especially since it's more realistic; the only thing I don't like about it is that it seems too "cramped." I wouldn't really mind if I had it though. Grass isn't a very big deal to me.
I have triangles. I wanted anything BUT triangles xD I have never had a long term village with circles lol. And only one of my long term villages had squares instead of triangles.
My grass is circular, and from past experience with the other AC games, I pretty much got used to whatever grass type I ended up with. Now I am actually really happy I got circles though; I had no idea it turned into stars until now!