Your questions are too broad, because you will get positive answers from people who thrive in the civil service and likewise from those who thrive in the pte sector environment. Meaning you will be back to square one.

To get answers specific to your situation, you need to let readers here know what your preferences are, your character, your interest, ambition etc..

Below are some leading questions to help you:

1. Is earning big bucks more important to you than worklife balance and job stability?
2. Are you good / thrive in a rule based environment or one where you have more freedom but with more risks?
3. Do you like meeting with people?
4. Are you a political animal?
5. Can you handle long overseas assignment?
6. Do you prefer to be the customer (read civil service) or the contractor (read pte sector)?
7. Do you prefer to be the one coming up with rules than to be the ones having to meet them?

I come across many young people like yourself who do not know what they want, so they asked general questions leading to nowhere.