I'm still an ACCA student in Sunway, I'd say to get exposure in the big four first.For me,i'll definitely work in one of the big 4 for 3 yrs so that i'm an official member of ACCA and MIA.But you see,when you look for such posts in job ad,very often one of the requirements are the experience in working one of the big four.

Not that people can learn more in small firms,however,yes in the sense that the company structure maybe small and one person have to multi-task and probably an auditor in that firm is responsible to handle other stuff.But it's always better to work in ur specialized field first,like tax consulation,banking...and big four is the place to train u up.

Working in big four is still the best way to enhance ur portfolio.

Which big four.....i'm sure everyone knows the ranking...in remuneration terms these four firms are the same.Workload,stress and job scope are also the same.But seems like those who happened to work in PWC has a lot to complained about their working environment,especially office politics.No surprising for me since elites all go to PWC and back stabbing is very common in this dog eat dog world.

If you don't want that much competition,can go to ernst and young or deloitte.Don't know about KPMG.