I would reset. I didn't on the DS version because that was my first AC expierence so I didn't knew about it then. But then again, I got such a nice town on the DS version.
I did restart the Wii version a few times when I was playing for the very first time, because I got an ugly girl or some impossible landscaping (from my point of view ofcourse
). I would only do it at the very start of the 3DS game, but if I must, I shall.
Honestly, I would never reset the whole game after playing for a certain amount of time, whatever version. Did that with Nintendogs once, and I regretted it so much later. Lesson learned.
By the way, I didn't knew there are different types of gras.