My wife's EX was uncircumcised, and so she's very familiar with an uncut penis.
In answering for her, she has said she has no preference. However, I also know she
really enjoys watching (and making) a guy get hard...which is not an uncommon enjoyment
among sexual women
(the whole transformation thing of watching a cock go from limpness to being rigid,
is very 'flattering' to women in that their presence is what's causing this reaction - it's one part of
foreplay that she loves).
And so, an 'uncut guy', obviously puts more of this kind of 'show' on, when he gets hard,
vs. a 'cut guy', and there's 'more' of a transformation.
Hence, I'd say deep down, that she would probably prefer an uncut guy.