Ultimately, you should go with whichever your gut feel is telling you. Where did you feel most at home etc.
However, that said, KPMG will look infinitely better on the CV... being a big firm, you will get lots of training, varied work etc etc
Think carefully and try to talk to a grad (of last year) from each firm - see how they feel. See which you think works best for you.
Some of us are big firm lovers, some of us are small firm types - you will need to work out which you are. If unsure, go for the one that helps your CV the most while you are trying to work it out and in this case thats KPMG