I can tell you the trend you'll find: younger women may, if they like anything associated with a body in good shape, prefer abs, but will be quite put off by men who are muscular, regardless of how lean they are. Older women (and I don't mean properly old, I just mean adult - anything beyond about 21) are unlikely to have much of a preference for abs, but will be much more interested in men with a more noticeable amount of muscle on them.