Its a tough one.
Looks wise it wouldn't even be a contest, Holly everytime. Something about Fearne though and whilst looks matter to an extent, I get a feeling that Fearne would be more fun to be around and would have a laugh etc, as well as let you fuck her all over. Holly would be the trophy bird you would be proud to introduce to your mum and I dare say would also let you fuck her all over.
If it was a relationship I would go for Fearne.
If it was a one off fuck I would go for Holly because she is that gorgeous I would happily have eaten the afterbirth she flopped out last week, and gone back for seconds.