I rather have both. I am sure there are some actresses that are better looking than Lena (and are blond - Lena's dark brows look odd with the blond wig) but can act as well. I have a tiny suspicion that Cersei's softening is Lena's doing, so I don't like her acting , but this subjective.

Anyway, Lena Headey is remarkably beautiful so obviously it's just q question of personal taste.

She is an attractive woman, but not beautiful, and I think this is objective, not personal taste issue. She has the face that is not symmetrical, teeth that are not stright, nose that is not stright, etc. - these are objective measurements of beauty which would have been strictly "upheld" in the olden days.

Taake me right , I like her as actress. But she is older and doesn't fit physical description.

Plus, there's the financial aspect!

but this is supposed to be a very expensive series?