Some basic math... assuming 5 days a week on the consulting job, that's only $178k. Now factor in the benefits of the fulltime job (insurance, retirement, lots 'o shite). Now remember cunsultants are never on the job 5 days a week for the full year. Let's say you're on 4 days a week and spend an average of 1 day a week visiting with potential employers: knock that down to $115k / year and still no benefits. Plus no job security.
Take the fulltime.