I've been toying with a similar idea except mine is a small electric car. I think the choice depends on the motors and battery voltages you select. If you are going to stay below 100 volts (say 72) then MOSFETs are probably easiest because they are easy to parallel because their resistance goes up with temperature so you can just put them in parallel with there own gate resistor. If you are going to use 300 or 400 volts which is what it sounds like you are thinking then IGBTs are the better choice, but they are hard to parallel unless you are a manufacture and can match them. If not they need a small resistance in the emitter that will drop .2 volts or so at rated current. These turn out to be large resistors. The modules are made with matched dies, but you pay dearly for it.
Do you have a choice for motors and batteries yet?