MBit Computraining interview questions

I got job offer letter for TCS Kolkata of the payroll of MBit computraining Pvt Ltd company. But I have doubt in my mind that third party payroll is good or bad. And the job is secure or not. Because my current job is in my hometown and at present I am working as dot net developer. So that why as like some doubts in mind about the MBit payroll job.