MIG welding exhaust question

I've been piecing together the exhaust in my 68 by joining the existing pipes with the newly installed headers using some mandrel U-bends I bought. The joints that I need to weld up are all butt joints with 16g pipe.

My question is when you guys weld up butt jointed exhaust tubing with a MIG, do you use a continuous bead /weave pattern, or is it best to stitch weld the joint by using short overlapping tacks??? Just curious what technique you folks use.