I’d pick 2xY/C over Y+. I find the Y+ cabin not worth it, and would appreciate the abilty to raise an armrest over night and go diagonal over what i still find to be quite crammed Y+. Ive not done long hauk Y for years, did one Y+ 7 years ago and realised econ would have been better with a vacant seat next to me, and I’m a C or not go kind of guy.

But i think more importantly, whats the qualifier for this? Some airlines do not give the option of buying a second seat, some close to arrival, etc. is it is simoly when you book, the seat next to you is vacant, which means in a world of seat reservations fees, at time of booking, even lne week out, two seats are very likely to be available.