Do you want a male (dog) or a female (bitch)? Usually you will find that the male of the breed is more dominant and aggressive than the female, but this is minimised in dogs which have been neutered, and is also relative between breeds.
Many experts consider that a female is less likely to stray but unless you have your bitch spayed (neutered) she will come into heat (season) twice a year and either have to be confined or placed in Kennels (unless you want an surprize pregnancy). A bitch on heat will attract the in tact (not neutered) male dogs from miles around and be a nuisance to you and especially to neighbours. In any case if you do not intend to breed with you dog, regardless of sex, it is advisable to have it spayed or neutered.