What is the best type of tree for games?

What is the best type of tree to use in a jungle setting? The game should be fast and beautiful.

For a jungle game research about the trees on the area of the game first, then create a tree using a small amount of polygons and in the branches use alpha textures like this simple example that i m posting. If you jungle will be big you ll need to think about LOD system to make your gameplay smother, research on the blender artists threads and on the internet to find some tutorials about it.
Good luck