On the web site of British Terrier Club I found the following sentences:
“Many books advise, that a bitch is an easier companion than a dog and whilst this may be true it is not necessarily the case with Wheatens and also for Kerry Blue. Whichever sex you choose with this breed you should remember that you are getting a terrier and you will get terrier characteristics to a greater or lesser extension. For example some terriers will be prodigious cat chasers whilst other will yawn at the very idea of such extertion! With Wheatens and Kerry Blue terriers it really does seem to depend on the individual animal, rather than its sex, as to how it responds to its family and other dogs. Some bitches can appear quite bossy and uppity compared to a more passive male....”
And this is really true!