Got both because I couldn't choose
The M18MT for "bashing" on the spot where over 25 other cars bash (with many 1:5 big scales and 1:8 savages).
And the M18T for indoor track "offroad" racing on carpet. It has the 1:10 conversion hubs to fit 1:10 wheels.
The MT got much bigger wheels (1:10 size), the T has small pin wheels but more grip. Both wear really fast however. So because of the bigger wheels the MT has more ground clearance. The MT has 8 shocks (for show
![Cool 8)](./images/smilies/icon_cool.gif)
) and two extra shock towers as where the T has anti-roll bars. To mount the MT body, there are additional body posts.
Both perform the same, I still can't choose which one is best. I like them both and I use them for different purposes.