@ethistu7
If I was you I would take the college and ignore the distance as it seems better in all aspects
It doesn't matter how close the sixth form is if
You find the environment detrimental to your mental health.
If you feel ill you are not going to succeed anyway
Also you've mentioned you have made friends already which is a definite plus over your sixth form
Also I see you're complaining about the rigid system and lack of independence in the college.
Tbh that is not a really an issue. The rigid system's benift will be reflected in your high attainment in your results as for the independence , you can do that in your own time . In some jobs you are expected to account for your time to the last minute..
In my experience the more relaxed an educational establishment the worse your attainment will be
Also as you have mentioned you found the environment was toxic in the sixth form, the old memories will come up to the surface and impede your progress in everything.
Also the facilities of an educational establishment make a big difference to your mindset. If you study in somewhere that is run down, you won't feel motivated to succeed.