I'll go out on a limb here...
As far as I can see, process has little to do with weld strength. Period.
It's either welded, or it is not.
Aluminum can present it's own set of problems. The biggest consideration is alloy compatability.
Boats are usually fabricated with 5000 series alloys, including 5083, 5086, 5554, etc. Welding with a 5000 series alloy would be a good choice here.
Silicon based alloys such as 4043 and 4047 can cause some metallurgical problems on 5000 series material.
While a standard mig gun without pulse should be able to handle .062 and greater thicknesses with proper techniques. Mig is much better for materials greater than 1/8. Below that, tig has a definite edge.
A pulser is a neat thing to have. It can allow us to go on thinner material with a thicker wire or very thin material with thin wire.
It can also help controlling distortion.
A pulser can get you lower than standard mig, but it will not replace tig in extreme situations.
Good luck
brande