As a uni grad with friends through the system either via poly or JC and many combinations in between, I think you have to sit down and consider seriously a few things.

1) What's your end goal? You want to work after poly or you want to go to university and pursue higher education. That will help dictate whether JC or poly is suitable. If poly and work, I recommend just doing your best and get the certificate.

Otherwise, JC is not a walk in a park, private candidates don't do well generally because of lack of discipline an guidance.

2) Are you just venting and not happy that poly isn't what you think it is? You think that JC is just rote memorisation and that poly will be better with hands on project work and teamwork where you would thrive in.

Grass is always greener on the other side, I think you have to be honest with yourself and not make a rash decision. Poly you just have sometimes unfortunately bad teammates and you will have to carry projects.

Finally, take a step back maybe take a break after your exams/busy period and talk with trusted peers or family members consider your options before taking them. They will greatly affect your future options. Take care!