Can destroy an opponent's monster with his effect.
Tributes himself to use effect.
Can only destroy face-up monsters.
These monsters have somewhat similar effects so they can be interchanged depending on which one you want in your deck. Throwstone Unit usually tributes himself to destroy a monster, but he also has the option of tributing other monsters you control so he can be activated multiple times, the disadvantage is that the monster he destroys must have a defense lower than his weak attack stat. Exiled Force is the more versatile option being able to destroy both face-up and face-down monsters, the only problem is you might see his low stats as somewhat of a con. Evilswarm O'Lantern can only destroy face-up monsters making him less versatile that Exiled Force, but with his decent attack you can use him as a beater until you need to use his effect.