Pretty much it came down to I've always ran Conti's in winter months and have been happy with them, at that point the CC3's weren't released and from the experience I've had with CC2's in the past I wasn't keen on them, as I always found them a bit more slidey than the Conti's.
I'm not a big fan of all-season's in general but given our winter's in N.Ire much like yourselves down south have been fairly mild, (although I do think this year will likely be another big winter freeze) hence opting for all seasons over full winter tyres.
Side note, I've never liked Pirelli's at all, took the original Pirell Neros off my Santiago's when new as they were awful, and have been seeing them constantly bulge lately on various cars.
