they are all good, but each is suited for a different application...

shocky yak and animal, indoors flying...

eflite yak and extremeflight yak, outdoors flying...

you can make an eflite fly indoors, or a extremeflight, but they won't outperform an animal or shocky if both are properly set up for indoors flying... and its the same for flying a shocky/animal outdoors...

note: i'm not too sure on the extremeflight, haven't heard much about it other than it is big, but built light, sounds like it could make a good in/out plane... but then again, the eflite yak is a pretty good choice if you want both indoors and outdoors...

back to the point, it all depends what you are doing with it... what kind of flying, and where? what about wind?