Ive done both,I say London is better,people who haven't done London A/L say London A/L is easy,but is not.The sylabus is more concise and accurate compared to local which has unnecessary parts added to it,The difficulty gradually increases unlike local A/LS,you can do it in parts,its modern,believe me I have done both,Local A/Ls priority is not to educate but to eliminate the maximum number of students and get the least number for the university,sometimes people who memorize pretty well can get into uni rather than smarter people,thats not education and thats why locals in not recognized anymore