Version 2 has various improvements that enhance gameplay. For instance, map is no longer mostly flat, I have added several mountains/hill of strategic value. Also the texturemap has been modified to look more realistic, in my opinion.
The first version had alot more detail; but it seemed to me that it looked good zoomed out, but up close it looked strange. And large boats can reach the full extent of both canals (the left one is a tight fit though :))