If you want an arguably easier life go for a female. It’s not guaranteed, as has been said, each bird is an individual, but in my experience males are more likely to be hormonally aggressive. Yet you get some sweet males all year round. I have a male Blue-headed Pionus called Kobe. He’s a big character and I wouldn’t change him in the slightest… but I always have to think before approaching HIS cage/swing etc especially in breeding time.
A close friend had a wonderful female White-capped, however she had to keep her caged during hormonal times as she would desperately seek out small spaces to nest in. She used to lay quite a few eggs each year. That’s not to say it happens to all females just as not all males will have a problem with aggression. Another person who used to be on here had a pretty aggressive female White-capped - I believe she wrote about her under “The good, bad and ugly about Pionus” here, which is worth checking out.
I wrote an article about pet Pionus for Parrots Magazine which you might be interested in reading:
Initially cautious, the shy Pionus parrot is often overlooked in favour of the larger more confident Amazon or the cuddly Cockatoo baby.
thinkparrot.com