Medium Cage Vs, Short Cage

So basically my rear derailleur is pretty mangled, so sadly i need to buy another one!
Im debating whether i should go with the ultegra 6700 GS or SS, however im not to knowledgeable with this so can anyone have any suggestions!


6700 SS -> for double chainring configuration

6700 GS -> for triple chainring configuration

You only really need the long cage if you are running a cassette with a large capacity or you have a big range in your cranketset (ie a triple or some non-standard chainring setup).

Short cage.

People only go long cage to compensate.