Really the only benefit to a bandmask for welding is for overhead work. As a general, blanket statement, a helmet is a more favorable tool. However, if the welding is specifically going to be overhead as you state, then a bandmask will actually be more comfortable for you. When I say "overhead", I mean exactly that. Especially if you're going to be "midwater" or having to hog in with a line rather than being able to stabilize off a solid brace or other structural component. But, for essentially any other application, the bandmask is going to be less than optimum if you have the choice available to you.