I've always found that ferreted rabs are the easiest, only by the fact that when you come home from ferreting its usually tea time (ish)
so theres plenty of time left in the day, they're fresh and warm and easy if you do them then..
When you come home from lamping, its usually off to bed and gutted rabs are left till the following day and thus more difficult.
Hardest ones are the ones that have been gutted, put in a bin liner and frozen. When you defrost them they don't have the same "give" IMO
Cheers, D.