I think its quite clear which is better for sidehopping (monty)... but then, that might just be the fact that the spanish are crazy.
I rode a mates koxx levelboss long, and i loved it, felt really nice on the back wheel. But the python beat it in that aspect.
Only problem with the python is that i found it near impossible to lift the front end whilst riding along, whereas the koxx was bearable. Guessing the short will be about the same, but just for shorter people.
Just thought id add, i think short bikes are the way forward! Monty riders can go so much bigger than anyone else ive seen, its immense. I think long bikes are a fad that should be grown out of. Saying that, im buying an echo team tomorrow (Y)" i wanna be part of the fad!