Wich ship is hardest to gank? Cutter, because it cannot be OHK even by full wing. Is that simple. That alone reason is enough to make cutter as "hardest to gank" for your knowledge. There is lots of other reasons too, like masslock and speed as well, do I have even mention its shields?
Talk all you want about 800 m/s small ships, but these are especially weak against LR rail snipe. You may run in time if interdicted by single ship, no matter if in wing or not, but good lock docking in such to anarchy station blocked by wing with AP rail snipers... Full wing like that will need only one strike, and you can foget to ever dock that can be blocaded that way, if like CG in anarchy or something, at your small "fast" ship if few certain cmdr's, would like to blockade a station like that. Silent running may help at bit, but unless u pass mail slot at 500 m/s during silent running, those who are really adept at rail snipe, would still notice any ship who would try that and atleast once hit it. I did that for while too, works like charm against any of these "speeders" who thinked they are smart enough to slip by. Big ships would always slip by, if they where clean, under 100 m/s, and not with enemy PP fraction in case of non-anarchy stations.
On other hand, if cutter pilot knows how to properly handle this ship, there is no trick to take it down. Well-flown cutter, can even survive direct station fire, and still have plently of time to get away from it (and from full wing at same time as bonus). Of course lots of evade manuvers are required, but it can be done, of course by not of these you every-day casuals wich some already mentioned here, that mostly fails to survive against simplest of gank tactics.
Single or even full wing of cobra's like that aint is a biggie either for a truly elite cutter, because of mines they usualy lack of ablilty to deliver more threating dps via distance, and if actually evading with prema-boosting, a cutter like that anyway wont be easy to reach for cobra miners. Even if said cutter loses its shields, if got decent armour around of 3k-4k, it aint should have problems with getting away.