There is no one best of anything, including various firearms. I would suggest that you make your choices among makers of better quality firearms. Typically that would include companies such as Beretta, Colt, Smith & Wesson, Walther, and the like.
Open
Glock
Best is a relative term that has to many variables.
Best left to a gunsmith
Best left to a qualifed gunsmith
Whichever one best suits your needs.
The Kel Tec in .40 is probably your best best.
galaxy pocket of course
inch or mm
Best left to a gunsmith
The daranger (not correct spelling sorry) its a small handgun that can eather fire a .45 or a .410 shotgun shell.
Best is very subjective. Sig Sauer and H&K are among the best in general.