If you like diamonds get a diamond, they are generally as a rule placid.
Just make sure you research how to care for them properly as their set up is a little different to most other pythons. Its not harder, just different. Lower temps, UV etc.
I love my diamond and she was my first snake, I work for a reptile company and we generally use an adult diamond or a
bredli when we do our shows.
Best thing i like about them is the way the start of as ugly ducklings and its exciting watching them get colour as they mature.