I agree with some of SLAYDUDE's points. There is something about a MT that no other RC offers. It is kind of fun running an RC that requires some skill from the driver in order to keep the RC from rolling over or from doing wheelies. Its actually lots of fun. At the same time though, it could get annoying at times. The best way i could describe it to someone getting into RC's is as follows....
The MT will be like a wild powerful beast ripping up through anything in its path. Bouncing all over the place, wheeling on command, and hopping along.
The 1/8 buggy is going to be like a well tuned off road machine which is going to feel more like a race car off road. Flying through anything it has ground clearance to go over. On road its going to be pretty much the same thing. It is going to handle on road like no other off road RC.
They are both extremely fun to drive on and off road (this is why i own one of each). The MT could at times get annoying with all the wheelies and roll overs it does which gets annoying after a while since you cant really turn at full speed with out this happening. I am huge into handling and this is why i love taking out my 1/8 buggy. There is just nothing made at the moment which could handle off roading better than a 1/8 buggy can. If you where to do laps on anything off road, there is nothing that will put in a faster lap time than a 1/8 buggy will. This is reason enough imo to want one!
Enjoy your hyper and post one here your impressions. I guarantee you they will be extremely positive ones!