I really enjoyed all three series for different reasons, though if I had to choose between The Librarians and WH13 I might be swayed more towards WH13. It seemed a lot less zany. The f/f ship in WH13 is definitely a plus point too :)

Eureka is different to other two in that it is SCIENCE rather than MAGIC even though Eureka shares the same canon universe as WH13. I love all the science in the episodes and how the problems are resolved. Plus I am a huge Jack/Nathan fan so that makes me biased :)

All three shows have strong female characters but WH13 showcases it best, I think!