This is a real good thread. But some past experience I think is required.
As many of you have built and needed to "D-Mill" different # amounts of ammo, let me start off. If you reload, You will at one time or another have to D-Mill (ie: take apart) certain amounts of ammo.
I've been reloading for over 35 years and there have been many times I made some BAD ammo that required "D-Milling".
I have found that for most pistol calibers, the kinetic pullers work really well. This is the only way to go.
I have tried to D-Mill these pistol rounds with a Collete puller, with minimal results. Most pistol rounds have round nose or FMJ which are difficult to remove the projectile with a Collete puller. Now Most rifle rounds really work good in a Collete puller.
I have both, If you reload both rifle and Pistol cartridges, you need both.