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At that price, I would go with the Mac Allister. The Excel only has two knobs on the base, compared to 4, which makes me think there is no adjustment to take up the play in how it sits on the rails. You want a snug fit but still able to slide along them. With no adjustment, it'll either be too stiff, and you'll shift the track mid cut. Or it will be too loose, and the saw will wobble about on the rails, meaning no straight cuts. Both outcomes resulting in potentially dangerous kick back from the blade catching in the cut if not straight enough.
Anyone heard of or used 'excel' power tools before? Contemplating a gamble on this: https://tools4trade.co.uk/products/excel-165mm-plunge-saw-kit-1200w-240v-with-2-x-700mm-guide-rail