sorry - i was a bit vague yesterday - i was typing one handed with a sleeping baby on me!
I am doing CIMA as I work for a private company and i just do the accounts for one of their sites. It is my understanding that ACCA is better for if you want to be a qualified accountant and work in an accounts practice etc, and that CIMA is the preferred route if you are working in the private sector.
However, as someone else suggested, it may be worth looking on the CIMA/ACCA and ICAEW websites to get a better flavour for what they offer
Maybe you could speak to your finance director as they should know which will fit better in the business you work in.
Also, like has been said, these can take a long time to complete and are quite costly, i would ask your employer what they are prepared to pay for. FI, there is usually a yearly subscription, books, exams etc. on top of that, for more of the advanced courses there are revisions sessions but these can be up to £1000 per module. If your company is only willing to pay for exams and subscriptions, then you need to think about the other costs that you maybe expected to pick up.
Hope that helped!
If i can think of anything else, i will let you know