miurasv,
It doesn't matter how many times or people you ask about differences between bikes, only you can make the decision which 1 to buy... Peoples opinions will be just that, Age, weight, how they ride or what they prefer may be different to your own (if you get my drift).. As someone has already suggested in another forum (I think) you posted in, is that you should test ride them all before you buy.. The shortcut posted below will give you some idea. However your only going to know and understand which is best for you, once you've test ridden the bikes of your choice/ options list. The difficulty here will be that an excellent condition 916/996SPS & 996/8R's 998FE aren't too easy to find to test ride (unless you know someone with the lot in a collection)...
Good luck though...