Well, Speedtree is originally an addon for 3DS Max and made for high resolution visualization renders (Although I personally prefer to use Vue for landscapes).
Only later did they start plugging it for use in games. I think the main problem with them is the amount of animation and details on individual branches and leafs. RoF doesn´t seem to have any animation on their trees which makes quite some difference.
Trees in RoF do turn with the camera, quite sure they are not flat 2d sprites though, you would definetely notice that. The stuff about whether or not RoF or CoD landscape looks better is highly subjective, most people compare CoD at standard bright summer day time with RoF and even then I think CoD landscape up close looks much more detailed, although I do love RoF for the smoothness and overall atmosphere. Try setting time in CoD to 19.00 or 5.30, looks a lot better I think
