We have a male and recently got a female...We got him when he was 3 months old and he was 100% trained within a month. He is very smart, and he is sweet as can be
Also, he was neutered when he was 1yr old...He never marks inside the house. He pees on puppy pads and squats to pee. When we take him outside, he pees (marks) in several places and lifts his leg sometimes. If you neuter them at around 6 months, you should have no problems at all. Good luck in your decision!