Opted with the Mainline Premium Economy as 1) I haven't tried it yet; 2) all aspects of seat (width, pitch etc.) are actually better than Prem Rouge; 3) Flight leaves 2040 to LHR vs. 22:10 on Rouge (we prefer earlier arrival); and 4) Much prefer to arrive at LHR to take tube into city

Return is from FCO so Rouge wasn't an option for that.

Thanks for all your suggestions!