MIG is also easier to operate. for example, take welding up a long seam on a new bumper. you could get the job done just as effectively using ARC and changing sticks like 50 times. Or you could run one continuous bead from start to finish without lifting your mask.

first and foremost, stick with where you're comfortable. but if you do a lot of welding, especially continuous (fab work like bumpers, rails, etc), you'll thank yourself for having that MIG machine. Drawback of MIG though is it takes a lot more $$$ to get good penetration into the thicker material (you really wanna be on a 220v machine)

-Rob