I totally understand where you are coming from, but you will likely struggle to do what you need to do with that set of bulldogs. They have a very short throat, won't turn and will bind up on most cuts longer then a few inches. They are mostly used to to trim s-cleats and angle stock, or to make short cuts through formed duct seams (button-lock, snap-lock, pittsburgh) prior to the pieces being hammered together. For those things they are irreplaceable. For general sheet-metal cutting you need to go with a set of lefts (red handle) and/or a set of rights (green handle).
The Midwest snips are good quality and are a really good choice for most folks. I am partial to Klenk snips from my time in the trades, but I don't necessarily think the extra cost would be warranted for the occasional use you described in your original post.
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