Version 2 is the newest version, it has some drawn in borders (so you'll clearly see the hexes), borderless is the same without the borders and the rivers and roads is an additional tile sheet that can be used in conjunction with the base set.
If you're just looking to throw something together quick I'd just grab the base version 2 and the tiled example if you wanna see it in practice. You can easily swap to the borderless or add roads later in Tiled
Hope that helps? :D