Lots of people prefer females over males.  Female preference is something ingrained.  Many people believe that females do not display alpha behaviors like "marking" and/or "mounting”, that they are more calm and attentive that the males, and that females do not participate in fighting over dominance.

This is NOT True!

In my experience it is the females who determine the pecking order, and who compete to maintain and/ or alter that order.  The females are, as a result more independent, stubborn, and territorial that their male counterparts.  The females are much more intent upon exercising their dominance by participating in alpha behaviors such as "mounting". There is a reason people utilize the technical dog term of "bitch" in a negative connotation - and it refers directly to the behaviors exhibited by the females of the dog world.

I have had both Male, and Females in my household. And in all the time that I have had dogs, the ONLY fights I have ever had to break up were between females.

On the other hand, males are usually more affectionate, attentive, and more demanding of attention. They are very attached to their people.  They also tend to be more reliable, and less moody. They are more outgoing, more accepting of other pets, and take quicker to children.  Most boys are easily motivated by praise and food, and so eager to please that training is easy. However, males can be more easily distracted during training, as males like to play so often. And no matter what age he is more likely to act silly, and more puppy -like always wanting to play games. Boys are fun loving until the day they die.  Females tend to become more reserved as they age. 

  Neutered males rarely exhibit secondary sexual behavior such as "mounting", or "marking" and lifting of legs. Once the testosterone levels recede after neutering, most of these behaviors (if they ever existed) will disappear.  Boys who were neutered early (by 5 months) usually don't ever  raise their legs to urinate. I strongly recommend having your male spayed before 6 months if you don’t plan to breed him. Even if he isn’t altered you can still train them not to have unwanted behavior with some patience.

And while the female will usually come to you for attention, when she's had enough, she will move away. While, the boys are always waiting for your attention and near at hand. Females usually are less distracted during training, as she is more eager to get it over with, and get back to her comfy spot on the couch.  The female is less likely to wage a dominance battle with YOU, but she can be cunning and resourceful in getting her own way. She is much more prone to mood swings.  One day she may be sweet and affectionate- the next day reserved and withdrawn or even grumpy.

The female also has periods if being "in heat" unless she is spayed.  Seasonal heats can be a month long nightmare- not just for the female, but you and every male dog in the neighborhood.  If you are not breeding, you'd be best off to have her spayed. Since during this time she can leave a bloody discharge on carpets, couches, or anywhere she goes.  She will be particularly moody and emotional during this time. A walk outside during this period can become hazardous if male dogs are in the vicinity, and she will leave a "scent" for wandering intact males to follow right to your yard, where they will hang out, and "wait" for days.

Before deciding on a male or female give consideration to any other dogs that may be in or around your home. Generally the Toy Poodle is not aggressive, and gets along well with other dogs, no matter what sex. Personality should be one of the major deciding factors when choosing your puppy.