Let's start at the beginning.
First, the hammer type bullet pullers are inertia pullers. They use Newtons law of motion. Second, they will damage the bullet nose when it hits bottom. Third, if you have a lot of bullets to pull they are a serious pain. Fourth, I've had one and used it for more years and more bullets than I care to count.
Now the press mounted collet type pullers. They are NOT hard to set up just follow the directions. (I know, I just lost all my at-a-boys.) If used correctly they only put minor scratches on the bullet. You only have to put enough pressure on the bullet to get it out of the case and remember when the bullet exits the barrel it is all scratched up anyway. These are much faster and cleaner to use. The bullet is in the collet and the powder is still in the case. The only down side is you must have a collet for each bullet diameter (22, 24 30 etc.).
Now having said all that, if you only have a few bullets to pull (a dozen or so) use the inertia puller. If you have a bunch to pull use a collet type. That's what I do and it works for me.
Hope this helps, Pecos