What is the difference between A'level, Foundation and Diploma?

Today my aunt asked me why didn't I study Diploma like his sons but chose A'level instead. I didn't know how to answer.....

To be very honest, I've done my A'level and doing LLB now but I'm not really clear what is the difference between A'level, Foundation and Diploma. The thing that I only know is that you have to take UK papers for A'level while Diploma/Foundation take local papers. Anything more than that, I'm not really sure.

So here the story continues....

My aunt kept telling me how good taking Diploma because it's better than A'level. The standard is higher and the papers are tougher. Well, I don't really care those things because I wanted to work a job related to law since I was young. Therefore, once I graduated from high school I went to education fair and asked for opinion. They suggested me to do A'level so I followed. I never thought about which course is better than the other one until my aunt brought it up.

So is what my aunt said is true? Is Diploma > A'level and an employer is more willing to hire a person with diploma qualification than someone with A'level?

If you have a degree then it doesnt really matter if you did a levels or diploma, they will look at your degree.