Easy decision for me, but I know I'm in the minority. I went for beauty.
I love cels from moving or special scenes, but I generally don't buy a cel from even my favorite scene unless the cel itself is aesthetically pleasing. In fact, several of my very favorite cels, (ie: both my Souzo cels, a couple of my Aoshi pan cels, quite a few of my Kenshin cels, several FY, GW and Esca cels, etc) I had ZERO idea where in the show they were from when I bought them. Or perhaps I had a general idea from an outfit or something, but couldn't identify the exact episode, let alone scene.
Beauty it is for me. I'll always go with the perfect portrait of a character I love over that B level shot of them in one of the best moments of the show.
Of course the ideal is the perfect shot of them from that moment, but duh.
