That's a good question.
Personally, though, I prefer the M1014. The range is almost as good as the Spas, and my biggest issue with the Spas is, if you miss the first shot you are pretty much dead.
The M10 on the other hand can fire very quickly and be accurate (from the hip which is how I always shoot my shotgun) and reliably kill in 1 shot as a defensive secondary (ie running through narrow hallways, etc).
There's my 2 cents.
Personally, though, I prefer the M1014. The range is almost as good as the Spas, and my biggest issue with the Spas is, if you miss the first shot you are pretty much dead.
The M10 on the other hand can fire very quickly and be accurate (from the hip which is how I always shoot my shotgun) and reliably kill in 1 shot as a defensive secondary (ie running through narrow hallways, etc).
There's my 2 cents.