Variety Version:
Download Link: https://libertycity.net/files/gta-4/88947-vegetation-textures-by-bisonsales.html

Summer Version:
Download Link: https://libertycity.net/files/gta-4/84518-vegetation-textures-by-bisonsales.html

Variety haves more different tree colors and the Summer version is green. I prefer the Variety version but I like both.
You can check the links too see pictures.