Mate as most people have said it comes down to personal preference. And it is true make sure you do your research on the snake you like before purchasing the last thing you want to do is just rush in to it and end up with a snake you don't like/can't look after. I personally would stay away from children's but perhaps a spotted, Stimson or maybe even a bredli.
One thing you will need to understand as well is keeping and caring for a snake is not cheap and you may find that once you get one you with get bitten with the bug as most of us all here have lol. One snake is never enough.
So it a nutshell:
1. DO YOUR RESEARCH PLEASE!!!
2. Dont be afraid to ask questions that is what we are all here for.
3. Definitely get the snake as a hatchie (they will bite you heaps but it doesn't hurt as their teeth are tiny however you need the snake to get used to you holding it)
4. Understand these animals are not like cats and dogs - THEY WILL BITE YOU IF YOU PISS THEM OFF
5. Make sure you have enough income to support the snake I.e: food, enclosure, bedding, heating etc.
6. Check your local vet or any vets in the area to see If any of them care for snakes because the last thing you want is a sick snake that you can't get help for.
7. Always make sure you get a movement advice when purchasing a snake.
8. This is the most important one of all - Have fun and welcome to
APS
Hope this helped
Michael from Chaos pythons