Of course, an interesting exercise is valuing Avios, TPs and loyalty benefits. So, a keen FT member would always consider such matters, as well as the +/-£10 or so of actual product differentiation. TP valuation is entirely personal, from £0 to £+++, depending upon the closeness to different status levels. Personally, I find Avios to be worth very little indeed - <1p per Avios. But then things like lounge access can add £30-50 to an overall flight value.

None of that of course is relevant here with such a price differential so it makes an easy decision, but I do find myself making the calculation quite often in my fight purchasing decisions.