Until recently my wife and I would always select, when available, 1A/1C when flying BA CE. However we’ve been bashed too many times in 1C by the bags of other boarding passengers, so for our next two BA CE flights this month we’ve gone for 1D/1F (in fact BA assigned us these seats automatically). If travelling solo I still prefer 1A.

In summary, travelling together - starboard; travelling solo - port.