I have a potential job that is a water tank,

The longest weld is 17" in length. Shortest weld is 7".
95" of weld length in total.

Material is 3003 AL .125" thick.

This tank will be hidden too. And possibly powder coated.

From A speed standpoint MIG will be much faster IMO. TIG will produce a better
looking weld.

My power sources are
Synchrowave 250
Invision 456 with Optima Pulser pendant

With this all said what process would you guys use?

Thanks guys.