both hobs and jills work differently it seems to be that the jills are a little quicker around the warren and can do the job with abit more pace were as the hobs seem to be methodical, take there time and stick with the job until it is done and the warren is empty or what wont bolt is dead, At the moment i keep 4 jills and 2 hobs on of which is vasectomised and the combination of both sexes seems to work just fine for me anyway the main thing to remember is only breed from good workers s**t breeds s**t so only breed from true workers and work whatever you feels works well for you!
Atb TBB