In Y, for me it's the DL 764 in exit row 30 or the KL 747 in the Economy Comfort mini-cabin with the two-seaters in row 11 - both offer unlimited leg room and good IFE, plus no middle seat. Seated in those seats in both of my upcoming TATL trips
In J, I'd probably go for the same aircraft types given the lie-flat seats on the DL 764 and row 77 on the KL 747 (angled lie-flat seats, but few things beat the upper-deck). Personally I'm not a fan of J on the A380 - feels more like a hostel dorm to me.