In reply to leon 1:
Funnily enough I was going to recommend the same (though I'm not selling mine)
I had a photon which I preferred the fit of compared to the Fitzroy but always found it a bit chilly.
The Berghaus parka has loads of fill and is proper toasty.
For winter hill walking, the photon was warm enough; for sitting on a winter stance I preferred the extra warmth of the Berghaus. Well worth the extra pack size and weight for my old bones!
Back to your actual question: the Rab one felt a better cut for me and had a superb hood. I'd buy one again given the choice of the two.