Pros
The best thing about it is that it is a "Big 4" firm. You can carry the name and people will give it weight because of it.
Cons
It's the smallest of the Big 4 and KPMG makes concessions regarding price (unlike PWC who does not give discounted rates). So, engagement teams eat their hours all the time to not go over budget but they run the risk of getting laid off due to low utilization. They accept clients that require lots of manual hours of data entry so they push the data entry to the staff rather than sending that work to the India Q center where it belongs so the crop of people moving up don't know anything about tax. PWC has internal proprietary software that cuts the data entry to a fraction of the time KPMG would spend giving it the staff to do, which frees up the PWC staff to actually learn more important concepts. The quality of training is a joke. No one in senior management and above really cares about your career, so watch your back. Being on the client side now and seeing PWC work my employer's account, I can see the difference in training and quality. I would not recommend choosing KPMG over the other Big 4 firms.