Great points especially considering comparison to other European carriers. I've never flown LH/AF TATL but sounds like BA stacks up well.

We were looking at it from the other way around - if you're US based and predominantly fly to London then (from SFO at least) it's a choice between UA, BA, VS. At SFO, the UA Polaris and VS lounges are far preferable. At LHR, I haven't experienced the UA lounge but I'd take VS Clubhouse over Galleries Clubs (CCR might edge VS slightly).

We don't currently have mega status with any airline so relying on class of travel for lounge access. I think based on lounge experiences and issues with CW seats (haven't tried CS yet) - assuming fairly equal pricing - BA comes out worst.

If flying F, I'd favor BA but for CW I think UA Polaris and VS Upper are better choices on this route. I accept that a lot of this is specific to SFO i.e. poor lounge, non-CS planes, and we're not BA's primary market.