Mt300 has the standard tank and vertical rear shocks. Some variation of this led have under seat storage. V1
Mt400 has the standard tank and the frame of the led is also a tank. The rear shock angle forward and attach below that little hoop. V1 air cooled cylinders and V1 with case reeds.
There are fancier versions, but I just covered what you’re most likely going to encounter. As for the step throughs, meh.