Best Seats on A330 UC & A346 PE

Hi V-Flyers!
A few months ago I asked the question on whether to book UC Outbound or Inbound on a LHR-NYC flight as a 40th birthday surprise. Finally booked! UC outbound and PE inbound. Soo excited!!
What are the best seats to book? At the moment, UC is on the A330 which is fairly available. PE is on the A346 - seats 19H&K, 21A&C, 21H&K, 22A&C and 22H&K are available.
Thanks in advance
A few months ago I asked the question on whether to book UC Outbound or Inbound on a LHR-NYC flight as a 40th birthday surprise. Finally booked! UC outbound and PE inbound. Soo excited!!
What are the best seats to book? At the moment, UC is on the A330 which is fairly available. PE is on the A346 - seats 19H&K, 21A&C, 21H&K, 22A&C and 22H&K are available.
Thanks in advance