I went to KYUEM so you could ask me if you need further info.

Ultimately, it depends on what you want in life.

If you're set on going to top/prestigious universities then A-level is definitely a must option. I have plenty of friends who went to LSE, Oxbridge etc.

If you're okay with decent universities, do consider foundation. Some of the foundation programmes give you direct entry route into their universities. Do google up, some of the universities are not bad at all.

Foundation is definitely easier than A Levels, faster route of progression.

In general you get what you pay for. A Levels is not easy without great teachers especially if you're thinking of taking History, English Lit.

KYUEM may be expensive but they have great level of support. Plus, the advantage of having top scholars in your class. My classmates were mostly intelligent scholars, some even top 20 in Malaysia.