neither; the smith uses proprietary mags, the colt has probs, the ruger is not bad, but too expensive in my book. The best is by far and away, the sig; it looks and feels just like it's big brother, and has great quality; nice tight tolerances, that you will actually have to break in proly first, with some hi speed solids for a few hundred rounds. then it will eat anything. It's layout , rails, folding stock, etc., are just like the sig 556. It is a fabulous piece, and the mags you use for it, will work in other 22/ar platforms. not sure the ruger will do that, and definitely the smith and the colt will not; theirs work with theirs only.