I am big collector of all kinds of stamps. When I started stamping projects as a hobby, I used mounted rubber stamps. These are rubber stamps that are mounted on wood. They generally have an image on the wood to show what they will stamp. Those were ok, but they are bulky to store. The other problem with them was that you could not see where you were stamping.
Then I found unmounted rubber stamps. These were mostly in sets.I liked them because they were easier to store. But still, I could not see exactly where I was stamping.
Finally, I found acrylic stamps. Easy to store in sets and as individual stamps. I could also see where I was stamping so that gave them a big advantage.