I like
Brook and
Brooke, but
Brook more. I don't think of
Brooke as dated but I guess it is. There is something kind of "refreshing" about
Brook in its unadornment. I also like that it's just a nature name rather than a word that had to be made namier via the addition of an E (I like
Sky more than
Skye too).
I like it for either gender. I know a guy named
Brooks.