I didn't have Impacts, just Ba5ics, but the AM40 certainly beats the hell out of them. 5 10s in general don't seem designed for wet climates, that's what did for mine, they fell apart after winter. Generally they just didn't have the build quality they should have, at the price. Cardboard insoles which disolved, various stitching pulled, and the sticky layer of the sole came off the upper sole. Also the lining of the upper wore very fast.
Not saying I wouldn't buy another pair of 5 10s but my AM40s were cheaper, almost as sticky (and still stickier than I need), have the optional stiffness inserts, far better bad weather manners with the lace flap and generally water resistant material, and seem better put together. It's a total win.
As for looks, they both make you look like a mong so it's a nil nil draw.