A Seecamp, at 11 ounces, is certainly the smallest, but not a gun you're going to shoot 10,000 rounds through.
The Guardian at 18 ounces, is a behemoth compare to the Seecamp, and thus may last a bit longer.
The Sig P232, while not small, is at least lighter than the Guardian, and should work for a lifetime and easily and reliably go that 10K round limit.
The tough and compact Sphinx 380 may be the pick of the durability liter, but it's a heavy beast compared to the others.
The best quality is the Beretta, but it too is much heavier and larger than the tiny Seecamp.
If you want tiny, get a Seecamp, if you want durable, get a Sig. Both should prove reliable as long as they last.