Distance Learning Mba

Hello Everybody,

I Am A MEchanical Engineer Having 4 Years Exp.
I Am Working In One Of The Automotive MNS In Design Department.
I Want To Explore My Career.
So I Need Help Regarding Distance MBA Or Part Time MBA.
I Don't Want To Leave My Current Job.
So Please Tell Me Which Will Be Beneficial Part Time Or Distance Learning??
And What Is The Exact Difference Between PGDBM And MBA (Distance Or Part Time)??
Which Feild Is Good To Boost My Current Work Domain In Future???