Come on, do a search, it's been discussed plenty of times.
In short, Type 9 is the more popular, the chassis has been designed for it, it's more compact. But it's specced for up to around 200 Nm of torque, although apparently it's handling more without much trouble. Bellhousings are separate from the box, so you could get aftermarket bellhousings to mate to other engines. MT-75 is a newer design, holds up more torque, has an integral bellhousing, but a bit bulkier. It will eat around 3 cm out of your pedal box width, which is not very wide to start with.
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