Have used both with Inkaid being my preference.
Dass is off my list due to their small packaging and pricing structure.($200.00 gal.)
Use light coats so your drying time will be shorter. Dust is a killer and also the reason I do not resell metal prints.
Several companies sell precoated metals and although somewhat more costly they are pristine and a joy to work with. Do a quick search on this site as you will find many good reference threads on the subject.