Generally by looking from a 'helicopter' view, both ICAEW & ACCA are equally good. Many people say ICAEW is more prestigious is becoz they're much older. If you're concern about prestige, then take ICA Scotland because they're the oldest chartered accounting body in the world. Just look at local uni, many people say UM is the best mainly becoz they're the oldest but in reality this is not the case, it all depends on the individual courses offered. In the world universities ranking, both UKM & USM rank higher than UM.

If you have made up your mind to do ICAEW, then go for ICAEW. If you have made up your mind to do ACCA, then go for ACCA. If you're still in dilemma like what you're now, I m sure in the next 10 years you're still undecided which one to choose. Why I say this is 'a person knows what is the best for himself/herself'. I chosed ICAA bcoz I know what is the best for me in my circumstances couple of years ago.

Just to let u know, ACCA with 5 years PQE can become member of ICAEW without having to sit for any exams.
ICAEW members regardless of how many years experience have to sit for the final 5 papers if they want to become ACCA member.