Agree with what others have said so far, you should go for what you're interested in and which firm seems like a good fit. Ideally go and have a visit at each place, talk to new joiners and have a chat.If you're looking for the cliched "which one is more prestigious", the general view I've heard would be LEK > Deloitte S&O > ACN > Deloitte tech. YMMV.