The hotspot is much heavier, but also more robust than the kangaroo and rookie.

The rookie has the advantige by having the turbine mounted lower in the fuselage like the hotspot , which reduces pitch changes at different throttle settings. It also can use thrust vectoring.

The Kangaroo is cheaper to buy than the rest :-)

The kangaroo and rookie are ARF`s , while the hotspot is a kit you have to build and glass.