resistive V inductive ballast

Hi all
Can some of you all knowing pig using guys please tell me what is the
differance between resistive and inductive ballast.

Steve Rodway has been using inductive ballast(1-5 MOT`s)and now Bill
the arcstarter has been talking about resistive ballast, so what gives.

What are the advantages/disadvantages of both.

Cheers guys
Mike Tucknott   
If at first you don`t succeed......

It must be someone else`s fault so
Find them; Blame them; Make them pay