I am not sure whether this has already been discussed here on forum or not but I will ask anyway. What's the advantage of owning TF, PF and MF when H9 does it all.

Depends on how many effects you use at the same time.

Having TF,MF and PF would allow 3 different simultaneous effects, while an H9 only has one.

The H9 has a wider range of effects, and of course takes up less floor space.

Horses and courses.