how do you make big decisions??

step 01: Find out what your priorities are.
step 02: Find out which school fits your higher priorities best.
step 03: Think about it until you feel comfortable with the desicion.
step 04: Act on that desicion.

You have to choose whichever school fits your needs best.

I had the same choice a couple years back, public versus private for high school. I chose public because the public high school where I am has programs that aren't offered at private schools near me. It has programs like sociology, psychology in relationships, multiple bio classes, creative writing, human anatomy, and a good gifted class. Since I'm going into psychology, it made mais sense for me to go to public school to get those courses.

You have to look at it the same way. Look at the courses each school offers and go to the school that has mais that interests you and will suit what you want to do with your life in the future. Don't worry about your friends. You can keep in touch with them no matter which school you go to, and you'll make new ones, anyway. I have like, a dozen friends who went to private high schools, and I still see them often enough.

Usually when i make a big decision i make a list of the pros and cons of each answer to the question. I break it down into small groups...i'm going to take your problem as an example
1. which is the furthest to travel to - can you get there in time, do they have free transport or do you have to pay and if so can you afford it?
2. one is free-dress you say - will you be comfortable in your own clothes in an environment that is not used to you? Will your style be bullied in some way and can you deal with that?
3. uniforms - do you have to pay for them and can your parents afford it every term to get you a new one? Will you feel comfortable in it?
4. Which school has the clubes and/or after school activities you enjoy and could take part in?
5. Which school is best for your needs? If you like art mais then maths, do they have a better art department then a maths department?
6. What are the success rates? Is one school marginally better then the other for a field of subject you could do well in?
7. Will one school give you mais confidence and ability to go further into the educational system then the other - such as scholarships and better teaching to get you to uni?
8. Are you actually Catholic? If not, are you willing to become so just to get in a certain school? Will you feel pressurised to convert if they find out you're not?

And so forth until you feel you've covered everything and see which has the mais yes'es.