I will say Manhattan is the best and then followed by Kaplan
and finally Veritas
. However this is my felling, which can be quite different from others.
Manhattan questions match the real GMAT question or little bit tougher than the actual GMAT questions. Kaplan
questions quite often go off track while they try to make questions harder.Veritas
does offer more number of hours and cheaper as compared to either Manhattan or Kaplan
So if you need more time then may be join Veritas
, if you need more tough questions go for Kaplan
. If you are somewhere in between need a decent fundamentals brush up as well as better feel of GMAT then Manhattan is the way.