These are my opinion if in selangor/kl area:
1) Chung Hwa KL, undeniably that they are the best chinese independent school in selangor/kl area, balanced focusing on SPM and UEC
2) Kuen Cheng, more focussed on SPM, most of the students gave up UEC (I heard they use final year to complete all the UEC subjects)
3) Tsun Jin, i graduated from there, same as Chong Hwa (balanced focusing on SPM and UEC), but it is quite stressful to study there (from 7.00 until 4.10pm, Monday to Friday and almost every Saturday have cocuriculum) and the traffic jams is the biggest issue lol
4) Hin Hwa, it can be considered if final goal is UEC, last year they achieved colourful results on UEC, but they not too focused on SPM

Er... Not too much lol
The info of Pin Hwa one is my friend who was graduated from there told me. However Chung Hwa Klang I not too sure 😅

I thought they are same due to their chinese names. Lol

If I no forget the co-curiculum is compulsory for every CIS, but the time is depended by the school, some would be held in weekdays.