I've used both and it is hard to tell which one is best... but the M32 is NOT hard to use and its not auto. the claymore is fun to use and 80% chance it won't kill you when standing behind it and it has great range. you can even nutshot.
Down south and around the corner, why do you need to know?
M32, its got 6 shots, you dont have to set it up like a mine and wait for someone to trigger it. Not to mention that its like having 6 he grenades. And for the person above, its the same as planting a mine, and the range is about 20m at most I think, I kno within 10, ur dead unless u got a heavy.