Coins animations maybe with particles

I want to make an animation which is a set of coins being thrown when you get a prize.
Let’s imagine 100 coins being launched like in a fountain (sorry for my English).

Which is the best approach for that?

Should I use animations/animators? Should I use particles?

For that number of coins, you should go with a ParticleSystem. Set one up by making the particles go upwards and make them be affected by gravity (gravity multiplier). Under renderer, set it to mesh and choose your coing mesh (or use a 2d billboard if you wish). Make them rotate with rotation over lifetime, and set up the collision so they bounce a bit.