I would say avoid the A343. For all the rest the seats are the new ones, with AVOD, and fixed shell (so people don't recline into your space). Timing really depends on how well you sleep on planes, what you need to do the day before and after, and how your body deals with jetlag.
(Note I guess it is possible that the A343 would have new Y by December, but I don't think we have visibility of the timescales for them to be converted yet)