I've got and use both apps. Here is the raw deal:
Both can do macro and micro scenes, but they have their specialty.
TG2 is the best for rendering macro scenes and large planetary fly throughs. Nothing else comes close, not even Vue, in imagery or ease of use (for that purpose). It can also do up close scenes, but its a bit more intensive than Vue for this.
So I think TG2 is the call here.
However, if you want up-close, tons of foliage, with little camera movement, then Vue is probably the best call (for now).