Both isn't the best idea.
Use a terrain editor that uses vertex alpha splatting (T.ED, A.L.E and a few others you find in the toolbox up in the menu) and make it a seperate thing.
you will not be able to maintain any visual quality on the path by using a single texture.
And the decal approach might be a little very tricky performancewise to do if you terrain is a little larger than tiny ...
Use a terrain editor that uses vertex alpha splatting (T.ED, A.L.E and a few others you find in the toolbox up in the menu) and make it a seperate thing.
you will not be able to maintain any visual quality on the path by using a single texture.
And the decal approach might be a little very tricky performancewise to do if you terrain is a little larger than tiny ...